Quaternary Science Reviews 58 (2012) 1e6 Contents lists available at SciVerse ScienceDirect Quaternary Science Reviews journal homepage: www.elsevier.com/locate/quascirev Bonneville basin shoreline records of a large lake during Marine Isotope Stage 16 Shizuo Nishizawa a, *, Donald R. Currey b,1, Andrea Brunelle c, Dorothy Sack d a Isogo, Yokohama 235-0023, Japan Department of Geography, University of Utah, Salt Lake City, UT 84112, USA c Records of Environment and Disturbance Laboratory, Department of Geography, University of Utah, Salt Lake City, UT 84112, USA d Department of Geography, Ohio University, Athens, OH 45701, USA b a r t i c l e i n f o a b s t r a c t Article history: Received 27 December 2011 Received in revised form 21 September 2012 Accepted 11 October 2012 Available online 7 November 2012 The occurrence of the 650,000-year-old Rye Patch Dam tephra within shoreline sedimentary sequences suggests the presence of a large lake in the Bonneville basin in North America during Marine Isotope Stage (MIS) 16. The observed shoreline sedimentology and stratigraphy indicate that the lake was expanding when the air-fall ash landed onto the lake water. The minimum estimated surface area of the 650 ka lake almost equals that of Lake Bonneville during the Provo stage in late MIS 2. The magnitude of the 650 ka large lake implies that the climatic and hydrologic conditions in the Bonneville basin during early MIS 16 might have been comparable to those in late MIS 2. Ó 2012 Elsevier Ltd. All rights reserved. Keywords: Bonneville Shoreline Marine Isotope Stage 16 Rye Patch Dam tephra Great Basin 1. Introduction The 135,000 km2 Bonneville drainage basin occupies the eastern part of the North American Great Basin (Fig. 1). Being hydrologically closed, lake size in the Bonneville basin is largely determined by climate through the net balance between precipitation and evaporation. The magnitude of fluctuating paleolake sizes in the basin, therefore, closely reflects changing effective moisture. Shifts in the polar jet stream’s mean path, which was influenced by the changing size of the Cordilleran and Laurentide ice sheets, have been long considered as one of the primary causes of large amplitude Pleistocene lake size fluctuations in the Bonneville basin (Antevs, 1948; Oviatt, 1997; Kaufman, 2003). Lake Bonneville, for example, is estimated to have had a surface area of 50,500 km2 at its maximum stage in the cool, wet, late MIS 2 climatic conditions whereas Great Salt Lake in today’s semiarid environment has had an average surface area of 4400 km2 over the last 150 years (Arnow and Stephens, 1990; Currey, 1990). A close linkage between large lake intervals in the Bonneville basin and periods of major glaciation is well illustrated in an investigation of the Burmester Core, which indicates that a large lake occurred only during some of the most extensive glaciations: MIS 16, 12, 6, and 2 (Oviatt et al., 1999). * Corresponding author. E-mail address: sn1734@geog.utah.edu (S. Nishizawa). 1 Deceased. 0277-3791/$ e see front matter Ó 2012 Elsevier Ltd. All rights reserved. http://dx.doi.org/10.1016/j.quascirev.2012.10.014 Few shoreline-based studies in the Bonneville basin provide records of large lake intervals older than MIS 6 with reliable age control. In contrast, a large number of studies have provided shoreline records of many lakes in the western Great Basin from the early to the late Pleistocene, by using tephrochronology (Morrison, 1991; Reheis, 1999; Reheis et al., 2002; Knott et al., 2008; Kurth et al., 2011). The shoreline-based lacustrine records in the western Great Basin played an important role in providing a basis for the hypothesis that a long-term decline in lake size throughout the Great Basin might have resulted from a regional drying and warming trend since the middle Pleistocene (Reheis, 1999; Reheis et al., 2002; Kurth et al., 2011). This study presents shoreline evidence for a large MIS 16 Bonneville basin lake and estimates its size by analyzing nearshore stratigraphy. Identifying the 650 ka Rye Patch Dam tephra in the context of shoreline stratigraphy makes it possible to estimate shoreline depositional environments and approximate surface area of the early middle Pleistocene lake. 1.1. Previous studies of MIS 16 lake in the Bonneville basin The possible existence of a deep lake in the Bonneville basin during MIS 16 (680e620 ka) was previously suggested by Morrison (1965), Eardley et al. (1973), Scott et al. (1982), McCoy (1987), Oviatt et al. (1999), and Kaufman (2003). These studies inferred that the regressive phase of the MIS 16 deep lake likely preceded the 2 S. Nishizawa et al. / Quaternary Science Reviews 58 (2012) 1e6 Fig. 1. Location of the Bonneville basin and lake surface area (after Nishizawa, 2010). The 50,500 km2 Lake Bonneville maximum extent (dark blue) (B5 shoreline of Burr and Currey, 1988, 1992), the 37,400 km2 650 ka lake (light blue), and the 4400 km2 Great Salt Lake (white). Localities discussed in the text: BCeBurmester sediment core; DCeDeep Creek dam; LVeLittle Valley; AeLake Lahontan; BeLake Jonathan; CeLake Manly; DeWind River Basin; Eepre-Illinoian glaciation deposits; pre-Illinoian Laurentide ice sheet extent after Roy et al. (2004). (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.) deposition of the Lava Creek B tephra 640 ka (Lanphere et al., 2004). Morrison (1965), Scott et al. (1982), and McCoy (1987) located the subaerially deposited Lava Creek B tephra overlying lacustrine sediment in the Little Valley gravel pit near Promontory Point, Utah (Fig. 1 LV). Oviatt et al. (1999) also identified Lava Creek B tephra directly overlying a major lacustrine unit in the Burmester sediment core (Fig. 1 BC). In addition, the amino acid analyses on mollusk and ostracode shells from the pre-Lava Creek B lacustrine sediment broadly implied an MIS 16 age for a deep lake (McCoy, 1987; Oviatt et al., 1999; and; Kaufman, 2003). All these studies indicate that a lake of unspecified magnitude (‘Lava Creek lake’ of Oviatt et al., 1999) existed in the Bonneville basin prior to the 640 ka Lava Creek B tephra deposition. 2. Study site The study site is located where a major paleostream (ancestor of modern day Deep Creek) flowed into Lake Bonneville during the last ice age (Fig. 1 DC). Around the Last Glacial Maximum, this stream carried meltwater from the alpine glaciers in the Deep Creek Range, forming numerous deltas as it flowed into Lake Bonneville (Currey et al., 1983). The Deep Creek Range (Fig. 1) is a high-angle rotational fault system with a 35 e44 tilt resulting in a very steep western slope, and a less steep eastern slope on which the study site is located (Miller et al., 1999). With its highest elevation of 3684 m at Ibapah Peak, the Deep Creek Range is underlain by an upper Precambrian and Palaeozoic shelf sequence, intruded by granite rocks of the Late Cretaceous (75 Ma) and EoceneeOligocene (39e35 Ma) ages (Miller et al., 1999; Osborn and Bevis, 2001). The 1979 excavation and construction of the Deep Creek Dam on Bureau of Land Management leased land (4018.5280 N, 113 56.1720 W, 1420e1438 m a.s.l.) exposed stratigraphy that resulted from a series of lacustrine shoreline depositions from the middle to late Pleistocene lake intervals. A gravel spit complex on the dam’s left abutment is the most salient shoreline- geomorphic feature at the dam site (Fig. 2), and was formed during multiple large lake events that occurred from MIS 3 to MIS 2 (Nishizawa, 2010). On the right abutment, several exposures show different lithofacies from those of the gravel spit complex on the left abutment (Fig. 2). This study examines the stratigraphy and sedimentology of the exposures on the right abutment. 3. Methods Sedimentary sequences at the study site were measured and described. Elevations at each measured stratigraphic section were determined by a combination of 1:24,000 topographic maps, a geodetic total station, benchmarks, and global positioning system. All surveyed elevations are accurate within 1 m. In addition, all observed lacustrine depositional features, except for marl facies analyzed in this study, were interpreted to be in the shore-zone from foreshore to backshore/lagoon (Currey and Sack, 2009). Fig. 2. A 2004 photo of Deep Creek Dam/Reservoir (dry), looking north towards the Bonneville Salt Flats, Silver Island Mountains, and Pilot Peak. Deep Creek flows from the left to the right of the photo. The dark dot on the left abutment is a 1995 Jeep Grand Cherokee for reference. An aspect of Fig. 3 is shown. S. Nishizawa et al. / Quaternary Science Reviews 58 (2012) 1e6 Samples were collected for marl, mollusk shells, and tephra layers. The marl and mollusk shell samples were radiocarbon dated at Beta Analytic Inc. in Florida. Electron microprobe analyses of the tephra samples were conducted by: F. Foit at the GeoAnalytical Laboratory in the Department of Geology, Washington State University, in 2002 (sample UT-02-ELPHK-02a, written personal communication) (Table 1); and M. Perkins at the Department of Geology and Geophysics, University of Utah, in 2002 (sample UT02-ELPHK-02b, written personal communication). Analytical conditions and procedures at the GeoAnalytical Laboratory were the same as those described in Hallett et al. (2001) and Martin et al. (2005). Table 1 shows the glass compositions of the tephra sample. These were compared to the standard glasses in the Geoanalytical Laboratory’s Pacific Northwest tephra database that contains >1500 samples. The similarity coefficient of Borchardt et al. (1972) was used as a discriminator. 4. Descriptions of stratigraphy The base of the Deep Creek Dam right abutment exposure is a >5-m-thick marl unit (unit 11, Fig. 3A) that contains moderately abundant ostracode shells. This marl yielded a nonfinite radiocarbon age of >43,120 14C yr BP (Beta-169982). Unconformably overlying this marl unit is a >3-m-thick greenish (in the web version) tan, clayey, laminated mud with abundant large ostracode shells (unit 10, Fig. 3A). On the wall facing southwest (Fig. 3B), this greenish (in the web version) mud is overlain by a 35-cm-thick layer of pebbles, which fine upwards, and range from angular at the bottom to subrounded at the top of the unit (unit 9, Fig. 3B). Overlying these pebbles is a 9-cm-thick thinly bedded to laminated tephra, which is interbedded with five to seven fine sand layers (unit 8, Fig. 3B) (1435 m a.s.l. at the measured section). The contacts between units 8, 9, and 10 are sharp, but conformable. Above unit 8, a reworked tephra gradually transitions upward into 20e25-cm-thick, medium to thick-bedded ostracodal silty mud (unit 7, Fig. 3B). A unit of 20-cm-thick oxidized subangular pebbles (unit 3, Fig. 3B) unconformably overlies unit 7. Unit 3 separates the 3 underlying older units from an overlying 5-cm-thick, fine lacustrine sand of MIS 2 age that contains moderately abundant Stagnicola shells dated as 20,230 120 14C yr BP (Beta-189275) (unit 2, Fig. 3B). Despite the substantial period of time separating unit 7 and MIS 2unit 2, no buried soils were observed. A thinly bedded 30-cm-thick sandy marl with abundant ostracode shells unconformably overlies the 20.2 14C ka sand (unit 2) and caps the exposure (unit 1, Fig. 3B). A northwest facing exposure (Fig. 3C) at the same site lies across a gully approximately 20 m to the southwest from the southwest facing wall (see Fig. 3A). Unit 10 of greenish tan clayey mud, unit 8 of the laminated tephra, and unit 7 of ostracodal silty mud with reworked tephra, are present at 1427e1431 m (unit 8 slopes up 2e 4 from southwest to northeast, see Fig. 3A). Here, however, the layer of pebbles (unit 9, Fig. 3B) between the greenish (in the web version) mud and tephra is absent (Fig. 3C). Instead, the tephra directly overlies the greenish (in the web version) mud. This contact between units 8 and 10 is sharp, but conformable. The tephra unit here is also 9 cm thick and interbedded with fine sand layers (unit 8, Fig. 3C). From unit 8 of the northwest facing exposure, samples were collected for tephra analyses (ELPHK-02a and ELPHK-02b). Above unit 8, a reworked tephra gradually transitions upward into 20e25-cm-thick ostracodal silty mud (unit 7, Fig. 3C). Unconformably overlying these units is a 25-cm-thick unit of gravelly mud (unit 6, Fig. 3C). This gravel consists of mostly angular pebbles, which appear to have originated from local rhyolitic and dacitic flows of unknown age. A 20-cm-thick mud unconformably overlies unit 6 (unit 5, Fig. 3C). Above this mud is a 40-cm-thick unit of angular pebbles in a muddy matrix (unit 4, Fig. 3A), which grades upward into beach boulders of MIS 2 age that crop out at the modern day surface. The sedimentology and stratigraphy of units 5 and 4 appear to indicate a regressive phase of an MIS 2 lake of an unknown age. 5. Interpretation of stratigraphy The water-laid tephra (unit 8) was identified as the Rye Patch Dam (RPD) tephra by F. Foit (written personal communication, Table 1 Electron microbeam analyses on Unit 8 tephra. Sample UT-02ELPHK-02a SiO2 Analyses normalized to 100 weight % Standard deviations of the analyses TiO2 Al2O3 MgO CaO MnO Fe2O3 Na2O K2O Cl Notes 71.66 0.45 14.47 0.39 1.53 0.03 3.32 4.53 3.49 0.13 Deep Creek Dam right abutment 0.38 0.05 0.13 0.05 0.14 N/A 0.12 0.16 0.13 0.02 Total # of shards analyzed ¼ 26 5 closest matches Source #1 70.90 0.43 14.80 0.35 1.42 0.08 3.36 5.20 3.50 #2 72.20 0.44 14.55 0.35 1.46 0.09 3.40 3.70 3.68 0.10 #3 71.72 0.33 14.46 0.38 1.34 3.44 4.95 3.30 0.10 #4 70.87 0.55 14.79 0.53 1.68 3.28 4.90 3.25 0.20 #5 72.70 0.44 14.40 0.39 1.49 0.04 2.22 4.60 3.40 0.10 0.93 0.95 0.88 0.91 0.97 0.99 0.98 0.97 0.99 0.67 0.87 0.82 0.92 0.92 0.99 0.99 0.95 0.95 0.93 0.97 Reference RPD Tule Lake Core at 65.38 m (Rieck et al., 1992) RPD Bonneville basin S28 core (Williams, 1994) Willowdale, Oregon; Infotec Research, Craig Skinner Upper ash, Summer Lake-Ana River Exposure locality; P. Wigand, Desert Research Institute Mt. Mazama Southwest Caldera Wall, Crater Pumice Castle Lake, Oregon (Davis, 1985) Similarity coefficient for 5 closest matches #1 #2 #3 #4 #5 Similarity coefficient weighted average 0.96 0.95 0.94 0.94 0.94 0.99 0.99 0.99 0.99 0.99 0.96 0.98 0.73 0.82 0.98 0.98 0.99 0.99 0.98 0.99 0.90 0.90 0.98 0.74 1.00 *All analyses by F. Nick Foit, GeoAnalytical Lab, Washington State University. RPD RPD Mt. Mazama Pumice Castle Same Same Same Same Same as as as as as #1 #2 #3 #4 #5 above above above above above 4 S. Nishizawa et al. / Quaternary Science Reviews 58 (2012) 1e6 Fig. 3. Deep Creek Dam right abutment, looking east, showing exposures and stratigraphic columns of southwest facing and northwest facing walls. All numbered stratigraphic units are the same in panels A, B, and C (i.e., unit 10 in panel A is the same unit as unit 10 in B and C). Unit 8 is the RPD tephra. 2002) (Table 1) and M. Perkins (written personal communication, 2002). The RPD tephra is believed to have erupted during an event that produced the Desert Spring ash-flow in the Cascade Range (Hill, 1985; Rieck et al., 1992; Reheis, 1999; Reheis et al., 2002). The RPD tephra was also identified in the Bonneville basin sediment core S208 (0.5 cm thick at a depth of 154.1 m) by Williams (1993, 1994). The depositional environment of the S208 RPD tephra, however, was not reported in either of Williams’ studies. Martin et al. (2005) summarized estimated ages of the RPD tephra that range from 630 ka to 690 ka. In the study of the Tule Lake core, Rieck et al. (1992) estimated the age to be 630 ka. The only available absolute date by laser fusion 40Ar/39Ar, 686 50 ka, was reported by Fleck’s personal communication (2004) to Martin et al. (2005). Following the improvement of precisions in the Lava Creek B tephra age estimate (Lanphere et al., 2004), Sarna-Wojcicki estimated the RPD tephra date to be 646 ka, based on its relative position to the overlying 639 0.2 ka Lava Creek B tephra and the underlying BrunheseMatuyama Chron boundary in the Tule Lake core (in the 2004 personal communication to Martin et al., 2005). Because of the large error associated with the 40Ar/39Ar RPD tephra date, we followed Sarna-Wojcicki’s estimated age, 646 ka. A future, more precise age estimate of the RPD tephra, will refine the timing and duration of this large lake in the Bonneville basin: an older date indicating a long lake interval starting from the MIS 16/17 boundary or early MIS 16; or a younger date indicating a short mid-late MIS 16 lake interval that ended with Lava Creek B tephra deposition. The absence of observable unconformities separating units 7, 8, 9, and 10 suggests that a shallow to deep lacustrine environment at the study site persisted during early MIS 16. Laminations of the tephra unit and its subsequent reworking also indicate that the airfall tephra was likely deposited in shallow water above wave base. The observed sedimentology and stratigraphy suggest that units 7 and 8 were likely deposited in a foreshore zone. Unit 9 was interpreted as beach pebbles in a shore zone from foreshore to backshore/lagoon (see Currey and Sack, 2009). When the RPD tephra (unit 8) was laid down in shallow water, it draped over these beach pebbles (unit 9). Fining up pebbles of unit 9 also suggests that the lake level was rising at the time of the RPD tephra deposition 650 ka. Because the Lava Creek B tephra appears to mark the end of a large lake as reported in previous Bonneville basin studies (Oviatt et al., 1999), it is likely that an MIS 16 lake of substantial size was expanding w650 ka, and then shrinking w640 ka. Estimating the exact size of the 650 ka lake through observed shoreline elevations alone is difficult because details of basin tectonics, and numerous hydroisostatic rebound events since MIS S. Nishizawa et al. / Quaternary Science Reviews 58 (2012) 1e6 16, are not well understood. The Deep Creek Range, with the study site located on its north end, comprises part of the 150-km-long north-south-trending Snake RangeeDeep Creek Range fault system (Miller et al., 1999). A high-angle rotational fault in the Deep Creek Range is reported to have accumulated at least 12 km of rapid slip in Oligocene time (37e34 Ma) and Miocene time (18e14 Ma) as a result of the Tertiary extension of the Basin and Range province (Miller et al., 1999). The Quaternary slip rate, especially from 650 ka to today, is unknown. In addition, the surveyed elevations in this study are reported with no adjustment for hydroisostatic rebound. Current models for the Bonneville lake basin hydroisostatic rebound are based on the MIS 2 Lake Bonneville chronology in which the lake started expanding approximately 26,000 calendar years ago (cal ka), and reached its maximum stage 18 cal ka (Oviatt, 1997; Bills et al., 2002). Despite uncertainties involving basin tectonics and hydroisostatic rebound, approximating the magnitude of the 650 ka lake from the observed shoreline elevations is useful for estimating MIS 16 hydrologic and climatic conditions in the Bonneville basin. In the Bonneville basin, once lake surface elevation is determined, lake surface area can be estimated because of its semi-linear relationship with lake surface elevation (Currey and Oviatt, 1985; Nishizawa, 2010). This study follows Godsey et al. (2005) by assuming a lake surface level to be 5 m at the time of deposition of a surveyed stratigraphic unit in a foreshore zone. Because unit 8, which contains thinly bedded to laminated tephra, appears to have been deposited within the foreshore zone, we interpreted that the observed maximum elevation of the 650 ka shoreline sediment, 1435 m, would indicate a lake surface elevation range of 1430e1440 m. It should also be noted that the lake continued to expand after unit 8 was formed, as indicated in the overlying unit 7. The actual lake size after the RPD tephra deposition was, therefore, likely much larger than our estimate. The lake surface elevation at 1440 m would have an area of w37,400 km2, which is 74% of MIS 2 Lake Bonneville’s maximum surface area, 50,500 km2 during the Bonneville stage (B5 shoreline of Burr and Currey, 1988, 1992) (Nishizawa, 2010) (Fig. 1). This estimated 650 ka lake area almost equals that of Lake Bonneville during the Provo stage in late MIS 2. The magnitude of the 650 ka lake indicates that the hydrologic and climatic conditions in the Bonneville basin during early MIS 16 were at least comparable to those of late MIS 2. 6. MIS 16 large lake in the Bonneville basin and northern hemisphere glaciation On a regional scale, the 650 ka large lake in the Bonneville basin is consistent with a number of MIS 16 large lakes reported in the western Great Basin (Morrison, 1991; Reheis, 1999; Reheis et al., 2002). Lake Lahontan (Fig. 1 A) appears to have left the highest shoreline complex, which was correlated with the Rye Patch Dam Alloformation (Reheis et al., 2002). This MIS 16 Lake Lahontan would be the largest Pleistocene lake ever identified in the western Great Basin. In Kobeh Valley, which lies between Lake Lahontan and the Bonneville basin (Fig. 1 B), the youngest lake sediments and highest beach gravels of Lake Jonathan are constrained by the RPD tephra (Reheis et al., 2002). Similar to the MIS 16 Bonneville basin shoreline facies, the RPD tephra marks the onset of the Lake Jonathan-MIS 16-transgressive phase, which eventually resulted in the lake overflowing and becoming part of the Lahontan drainage system (Reheis et al., 2002). Moreover, the highest shorelines of Lakes Columbus, Hubbs, Newark, and a lake in Pine Valley, suggest that the largest Pleistocene lakes in these western Great Basin subbasins likely formed during MIS 16 (Reheis et al., 2002). In Death Valley (Fig. 1 C), the Lava Creek B tephra was found interbedded 5 with lacustrine sediments, indicating the presence of a perennial lake, Lake Manly, during a substantially wet phase in MIS 16 (Knott et al., 2008). Because MIS 16 paleoshoreline data from Death Valley are currently limited, an estimated dimension of MIS 16 Lake Many varies from a large lake to several disconnected small lakes (Knott et al., 2008). With this study’s finding from the eastern half of the Great Basin added to the large lake reports from the western Great Basin, it is highly likely that many major lake basins throughout the Great Basin contained large to the largest Pleistocene lakes during MIS 16. The discovery of MIS 16, and other early Pleistocene lake shoreline features that lie higher than those of the MIS 2 highstand in the western Great Basin, have led Reheis (1999), Reheis et al. (2002), and Kurth et al. (2011) to suggest a long-term decrease in effective moisture available to the region from the middle to the late Pleistocene. Reheis et al. (2002) attributed this drying trend to interactions among such factors as climate, tectonics, drainage changes, and changes in moisture sources. The exact mechanism or processes of how these factors interacted with each other over time, however, remain to be explored. Meanwhile, currently available lake shoreline data in the Bonneville basin from the early to the late Pleistocene, except for MIS 2, is too insufficient to examine this long term drying trend. Occurrences of exceptionally large MIS 16 lakes in the Great Basin are consistent with records of North American continental ice sheets. In North America, the MIS 16 Cordilleran and Laurentide ice sheets expanded more than they did during MIS 2, indicating a greater ice volume during MIS 16. Rocky Mountain glacial deposits, for example, indicate that one of the greatest glacial advances occurred during MIS 16 (Chadwick et al., 1997; Pierce, 2004). Glacial outwash deposits containing the Lava Creek B tephra typically correlate well with the most extensive moraines in the Rocky Mountains, e.g. the Sacagawea Ridge glaciation in the Wind River Basin, Wyoming (Chadwick et al., 1997; Hall and Jaworowski, 1999) (Fig. 1 D). By using paleomagnetic measurements, till compositional data, and the Lava Creek B tephra beds from glacial sedimentary sequences in Iowa, Nebraska, Kansas, and Missouri (Fig. 1 E), Roy et al. (2004) suggest that the MIS 16 Laurentide ice sheet formed some of the seven pre-Illinoian (before MIS 10) advances that extended further south than those of the Last Glacial Maximum (Fig. 1). This apparent correlation between the large continental ice sheets and large lakes in the Great Basin seems to support Antevs’ model (1948) that pluvial lake level changes during ice ages in the Great Basin, including the Bonneville basin, were mainly caused by shifts in the polar jet stream’s mean path, which was influenced by the changing size of the Cordilleran and Laurentide ice sheets. On the hemispheric scale, MIS 16 left a pronounced d18O profile in the Quaternary deep ocean sediment records (Raymo, 1994). Lang and Wolff (2011) characterized MIS 16 as a particularly strong glacial in both planktonic and benthic d18O, yet rather weak in sea surface temperature records. They suggested that the isotopic strength of MIS 16 could indicate more of an ice volume record than a climate signal. MIS 16 also marks the beginning of glaciations, driven by the 100,000 year orbital cycle, with longer duration and more ice volume than those driven by the preceding 41,000 year orbital cycle (Ruddiman, 2001). Here, we have presented evidence of the first measurable Quaternary large lake in the Bonneville basin, which appears to have coincided with MIS 16dthe first long and extensive Quaternary glaciation. This finding is supported by the proposed linkages between fluctuating lakes in the Great Basin, migrating mean position of the polar jet stream, expanding/contracting ice sheets, and orbital cycles (Antevs, 1948; Oviatt, 1997; Oviatt et al., 1999). 6 S. Nishizawa et al. / Quaternary Science Reviews 58 (2012) 1e6 Acknowledgements Authors thank: Nick Foit and Mike Perkins for tephra analyses; Nancy Carruthers, Molly Hanson, and Takashi Nishizawa for field assistance; and Shawn Blissett for improving the manuscript. Don Currey was partially supported by National Science Foundation grants SBR-9817777 and EAR-980924. Two anonymous reviewers’ comments significantly improved the depth and context of the manuscript. References Antevs, E., 1948. Climatic changes and pre-white man. In: The Great Basin, with Emphasis on Glacial and Postglacial Times, vol. 38. Bull. of the Univ. of Utah, pp. 167e191. Arnow, T., Stephens, D., 1990. Hydrologic Characteristics of the Great Salt Lake, Utah: 1847e1986. U.S. Geological Survey Water-Supply Paper 2332, 32 pp. Bills, B.G., Wambeam, T.J., Currey, D.R., 2002. Geodynamics of lake Bonneville. In: Gwynn, J.W. (Ed.), Great Salt Lake: an Overview of Change. 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