SHELF – 100m
Visual Core Description for RC27-1
Date described: 30 Jul 1987 Described by: J. Fairclough 0-67 cm:
WASHOUT - PISTON EFFECT 67-103 cm: TERRIGENOUS MUD .
(Clay), olive gray (5Y3/2), moist and firm. Carbonate content low.
Coarse fraction 1-5%, consisting of dominant mica. less common
glauconite, rare quartz, foraifera, foraminiferal fragment and dark
minerals, and trace sponge spicules, pteropod fragments and organic
fibers. Basal contact is marked by beginning of piston effect interval.
103-253.5 cm: WASHOUT - PISTON EFFECT 253.5-544.5 cm:
TERRIGENOUS SANDY MUD [Sandy clay], olive gray (5Y3.5/1.5],
moist and firm. Carbonate content low. Coarse fraction 20%, consisting
ol dominant mica, less common quartz and glauconite, and trace
foraminifera, foraminiferal Iragment, dark minerals, organic fibers and
sponge spicules. ROBERT D. CONRAD 27-01 TW Date described: 06
Aug 1991 Described by: T. Bray 0 to 8 cm FORAMINIFERAL
(RADIOLARIAN) OOZE [Foraminiferal ooze]; Pale yellowish brown to
dark yellowish brown (10YR5/2). Minor mottlings. Moist and firm.
Carbonate content is high. The coarse fraction 14 % consists of
abundant foraminifera and their fragments, common amounts of
radiolaria, rare amounts of diatoms and trace amounts of mica, spicules,
fish teeth, and insect fragments. The basal contact is a gradual color
change. 8 to 20 cm CALCAREOUS NANNOFOSSIL (NONBIOGENIC
CALCAREOUS) OOZE [Chalk]; Dark yellowish brown (10YR4/2). Minor
mottling. Moist and firm. Carbonate content is high. the coarse fraction 8
% consists of abundant foraminifera, their fragments and radiolaria,
common amounts of micrite, rare amounts of diatoms, spicules, and
pyrite concretions. The basal contact is a gradual color change. 20 to 33
cm NONBIOGENIC CALCAREOUS (CALCAREOUS NANNOFOSSIL)
MATERIAL [Chalk]; Light olive-gray to medium olive-gray (5Y5/1). Slight
mottling. Moist and firm. Carbonate content is high. The coarse fraction
11 % consists of abundant amounts of foraminifera and their fragments,
common amounts of radiolaria, rare amounts of diatoms, and trace
amounts of mica and insect fragments. The basal contact is rapid and
distinctive color change. 33 to 44 cm BIOCALCAREOUS
(TERRIGENOUS) MATERIAL [Chalk]; Olive-gray (5Y3/2). Minor
mottling. Moist and firm. Carbonate content is high. The coarse fraction
8 % consists of abundant foraminifera, and their fragments, common
amounts of micrite and radiolaria, rare amounts of diatoms. The basal
contact distinct color change. 44 to 47.5 cm CALCAREOUS
NANNOFOSSIL (TERRIGENOUS) OOZE [Marl]; Moderateyellowish
brown to dark yellowish brown (1 OYR4.5/3). Minor mottling. Moist and
firm. Carbonate content is moderate.The coarse fraction 21 % consists
of abundant foraminifera and their fragments, common amounts of
radiolaria and micrite, rare amounts of diatoms and sponge spicules,
trace amounts of pyrite concretions. The basal contact is a gradual but
distinct color change. 47.5 to 53.5 cm BIOCALCAREOUS
(FORAMINIFERAL ) MATERIAL [Chalk]; Moderate yellowish brown to
pale yellowish brown (10YR5.5/3). Minor mottling. Moist and firm.
Carbonate content is high. The coarse fraction 22 % consists of
abundant amounts of foraminifera and their fragments, common
amounts of micrite and radiolaria, rare amounts of sponge spicules and
diatoms._
SLOPE - 1300m
Visual Core Description for VM7-70
Date described: 4 October 1966 Described by: R.Meijer Note:
Description of a dry core. 0-160 cm: Brown sandy clay light gray (N7)
grading downward to pale yellowish brown (10YR6/2), brittle but noncompact. Homogeneous throughout. Worm burrow present in top 30
cm. Sand fraction (approximately 40%) is composed primarily of subangular, equigranular quartz grains. Micaceous mineral, green
micronodules and juvenile foraminifera (Globigerina) also present in
minor amount. High carbonate content. Manganese slight positive.
Basal contact is sharp. 160-165 cm: Red sandy clay, moderate orange
pink (10R7/4), non-compact. No visible structure. High carbonate
content. Manganese moderate positive. Sand fraction (approximately
20%) is composed primarily of rounded to sub-angular quartz grains
(red stain); some quartz and quartzite grains (up to 0.5 mm) are
significantly larger than general sand fraction. Some type of fiber is
present which intertwines and retains part of the sand. Lower boundary
is slightly gradational yet still distinct. 165-560 cm: Brown sandy clay
pale yellowish brown (10YR6/2) to light olive gray (5Y6/1), consolidated
and brittle. Homogeneous throughout. No apparent structure. Carbonate
content is moderate to high. Manganese test negative. 320 cm: sand
fraction,approximately 40%, is composed of a fine quartz sand, subrounded to sub-angular. Some coarse sand grains present. 1% opaque
mineral, one quartz grain 3x3x3 mm; 460 cm: sand
fraction,approximately 60% is composed of sub angular to sub-rounded
quartz grains (fine sand), slightly higher percentage of opaques than
sample above. Pebbles up to 10x5x3 mm present--mica schist,
quartzite, labradorite, quartz, and hornblende. A few foraminifera
present. Large pebbles are present at: 200 cm - 35x20x10 mm 260 cm 15x5 x ? mm 345 cm - 50x30?x10 mm 380 cm - 10x10x ? mm No lower
boundary. Trigger Weight Date Described: 29 July 1968 Described by:
R. Krauser 0-23 cm: Sandy clay, pale yellowish brown (10 YR 6/2), dry,
hard and apparently homogeneous. Carbonate content low.. Coarse
fraction about 15% , consisting of quartz (dominant), glauconite, mica,
and planktonic foraminifera. Quartz is fine to medium sand sized and
often sub-angular to sub-rounded.
RISE – 3900 m
Visual Core Description for RC22-9
Date described: 14 November 1979 Described by: R. J. Failla 0-16 cm:
FORAMINIFERAL SAND Disturbed mixture of [clay] and [foram sand],
pale yellowish brown (10 YR 6/2), moist and firm, Carbonate content
high. Coarse fraction of [clay] 15%, consisting of abundant for aminifera
and foraminifera! fragments, common shell fragments, quartz and
sedimentary rock fragments, rare dark minerals and trace glauconite.
Coarse fraction of [foram sand] 90%, consisting of abundant
foraminifera, foram fragments and quartz, common shell fragments, rare
sponge spicules and trace sedimentary rock fragments, dark minerals
and glauconite. Basal contact a gradational color and textural change.
16-200 cm: TERRIGENOUS MUD WITH TERRIGENOUS (FORAM)
MUD Interbedded [foram clay] and [silty clay], rhythmic bands of
moderate brown (5 YR 4/4), dark yellowish brown (10 YR 4/2) and
moderate yellowish brown (10 YR 5/4), moist and firm. Carbonate
content low. Coarse fraction of [foram clay] 10%, consisting of abundant
foraminifera, common quartz and foram fragments, and rare
sedimentary rock fragments and glauconite. Coarse fraction of [silty
clay] 10-15%, consisting of abundant quartz and dark minerals,
common sedimentary rock fragments, forams and foram fragments, and
rare glauconite. Basal contact a gradational color and textural change.
200-204 cm: FORAMINIFERAL SAND [Foram sand], pale yellow brown
(10 YR 6/2), moist and firm. Carbonate content moderate to high.
Coarse fraction 80%, similar to [foram sand] in unit from 1-16cms. Basal
contact a sharp color and textural change. 204-448 cm:
TERRIGENOUS MUD Interbedded [clay] and [silty clay], rhythmic
bands of moderate brown (5 YR 4/4) to light brown (5 YR 5/6) to dark
yellowish brown (10 YR 4/2), moist and firm. Carbonate content low.
Coarse fraction of [clay] >1%, consisting of abundant quartz, common
foram fragments and dark minerals, rare forams and mica, and trace
glauconite. Coarse fraction of [silty clay] 1-5%, otherwise similar to [silty
clay] unit from 16-200cms. Basal contact a gradational color change.
448-495 cm: TERRIGENOUS MUD Disturbed mixture of [silt] and [clay],
dark yellowish brown (10 YR 4/2), moist and firm. Carbonate content
low to moderate. Coarse fraction of [silt] 40%, consisting of abundant
quartz and dark minerals, common foram fragments, rare forams, and
trace mica, sponge spicules and glauconite, Coarse fraction of [clay]
10%, otherwise similar to [clay] unit from 204-448cms. Basal contact a
sharp color change. 495-583 cm: TERRIGENOUS MUD Interbedded
[clay] and [silty clay], rhythmic bands of moderate brown (5 YR 4/4) to
dark yellowish brown (10 YR 4/2), moist and firm. Carbonate content
low to moderate. Coarse fraction of [clay] 10-20%, similar to [clay] unit
from 204-448cms Coarse fraction of [silty clay] 30%, otherwise similar to
[silty clay] unit from 204-448cms. CONRAD 22-09 TW Date described:
14 November 1979 Described by: R.J. Failla 0-13 cm FORAMINIFERAL
SAND [Sand], light brown (5 YR 6/4), moist and firm. Carbonate content
high. Coarse fraction 80%, consisting of abundant foraminifera and
foram fragments, common shell fragments and quartz, rare dark
minerals and mica, and trace echinoid spines and sedimentary rock
fragments. Basal contact a gradational color and textural change. 13-63
cm TERRIGENOUS MUD WITH FORAMINIFERAL MUD [Clay]
laminated with [foraminifera! silty clay], moderate yellowish brown (10
YR 5/4) to dark yellowish brown (10 YR 4/2), moist and firm. Carbonate
content low to moderate. Coarse fraction of [clay] 15%, consisting of
abundant quartz, common dark minerals and sedimentary rock
fragments, rare forams and foram fragments, and trace sponge
spicules, shell fragments and glauconite. Coarse fraction of [foram silty
clay] 30-40%, consisting of abundant foraminifera and foram fragments,
common shell fragments and quartz, rare dark minerals and trace
sedimentary rock fragments and glauconite. NOTE: Trigger weight and
piston core have good color and textural correlation._
ABYSSAL PLAIN 5900m
Visual Core Description for VM26-155
Date described: 26 August 1969 Described by: J. Daubenspeck
GENERAL: Core is composed entirely of clay with inorganic elements of
very rare mica, quartz and palagonite and having a bio element of very
rare foraminifera frag ments. Zonal changes are due to texture, from
soupy to firm,and color. Compo sition of the core is very uniform
throughout. 0-10 cm: Clay, dark yellowish brown (10 YR 4/2), moist, soft
and smooth. Carbonate content nil. Coarse fraction less than 1%, con
sisting of very rare amounts of quartz, mica and palagonite. Bio-element
consists of extremely rare foraminifera fragments. Basal contact
gradational in color. 10-61 cm: Clay, between pale and dark yellowish
brown (10 YR 6/2 and 10 YR 4/2), moist, soft, smooth and lightly
burrowed. Car bonate content nil. Coarse fraction and composition
similar to the 0-10 cm zone. Basal contact gradational in color. 61-253
cm: Clay, between light olive gray and olive gray (5 Y 6/1 and 5 Y 4/1),
moist, soft to soupy, smooth and disturbed. Carbo nate content nil.
Coarse fraction and composition similar to 0-10 cm zone. Basal contact
moderately sharp in color. 253-274 cm: Clay, between pale and dark
yellowish brown (10 YR 6/2 and 10 YR 4/2), moist, firm and smooth.
Carbonate content nil. Coarse fraction and composition similar to the 010 cm zone. Basal contact sharp in color. 274-342 cm: Clay, between
dark yellowish brown and olive gray ( 10 YR 4/2 and 5 Y 4/1 ), moist,
soft and smooth. Carbonate content nil. Coarse fraction and
composition similar to the 0-10 cm zone. Basal contact sharp in color.
342-396 cm.: Clay, between pale yellowish brown and pale brown ( 10
YR 6/2 and 5 YR 5/2 ) at the top, becoming olive gray (5 Y 4/1) at the
bottom. Carbonate content nil. Coarse fraction about 3%; composition
similar to the 0-10 cm zone, except mica is common at the bottom of
this zone. Basal contact sharp in color. 396-524 cm: Clay, between pale
and dark yellowish brown ( 10 YR 6/2 and 10 YR 4/2 ), in the top and
bottom portions of the zone and between moderate and dark yellowish
brown ( 10 YR 5/4 and 10 YR 4/2 ) in the center portion. Carbonate
content nil. Coarse fraction and composition similar to the 0-10 cm
zone. Basal contact gradational in color. 524-545 cm: Clay, between
dark yellowish brown and olive gray (10 YR 4/2 and 5 Y 4/1), moist, firm
and smooth. Carbonate content nil. Coarse fraction and composition
similar to the 342-396 cm zone. Basal contact sharp in color but
disturbed. 545-683 cm: Clay, alternating layers with colors of dark
yellowish brown (10 YR 4/2) and between pale and dark yellowish
brown ( 10 YR 6/2 and 10 YR 4/2), moist, firm and smooth. Carbo nate
content nil. Coarse fraction and com position similar to the 0-10 cm
zone. Basal contact gradational in color. 583-758cm: Clay, olive gray (5
Y 4/1) at the top and bottom portions of the zone and between light olive
gray and olive gray ( 5 Y 6/1 and 5 Y 4/1 ) in the center portion . Carbo
nate content very low. Coarse fraction and composition similar to the 010 cm zone. Trigger Weight Date described: 26 August 1969 Described
by: J. Daubenspeck 0-43 cm: Clay, dark yellowish brown (10 YR 4/2) at
the top, changing gradationally to between dark yellowish brown and
olive gray (10 YR 4/2 and 5 Y 4/1), at the bottom, moist, firm, smooth
and very lightly burrowed. Carbonate content nil. Coarse fraction nil.
Note: Trigger core similar to piston core._
RIDGE FLANK – 2000m
Visual Core Description for VM30-92
Date described: 19 March 1974 Described by: C. Perissoratis
GENERAL: Interbedded foraminiferal ooze, foraminiferal marl ooze and
foraminiferal chalk ooze. Sediment is moist, firm, burrowed and locally
unconsolidated, interbedded and interlaminated. Coarse fraction high to
very high. Biogenic elements are planktonic and benthonic foraminifera,
sponge spicules, echinoid spines, pteropods, diatoms and Radiolaria.
Inorganic elements are quartz and mica. Authigenic elements are
manganese micronodules. 0-80 cm: Foraminiferal ooze grading into
foraminiferal marl ooze, pale yellowish brown (10 YR 6/2) to grayish
orange pink (5 YR 7/2, moist, firm and slightly burrowed. Carbonate
content high. Coarse fraction about 80%, consisting of abundant
planktonic foraminifera, rare quartz, Radiolaria, benthonic foraminifera,
sponge spicules, echinoid spines and manganese micronodules. Basal
contact a sharp change in composition. 80-84 cm: Foraminiferal ooze,
grayish orange pink (5 YR 7/2) to grayish orange (10 YR 7/4), moist,
firm and unconsolidated. Carbonate content high. Coarse fraction about
90%, consisting of abundant planktonic foraminifera, rare benthonic
foraminifera, sponge spicules, echinoid spines, quartz, mica, diatoms
and Radiolaria. Basal contact a sharp change in composition. 84-125
cm: Foraminiferal marl ooze grading locally into foraminiferal ooze, pale
yellowish brown (10 YR 6/2) to grayish orange pink (5 YR 7/2), moist,
firm and slightly burrowed. Carbonate content high. Coarse fraction
about 40-50%, consisting of abundant planktonic foraminifera, r e
benthonic foraminifera, manganese micro nodules, sponge spicules,
quartz and mica. Basal contact a sharp change in color. 125-232 cm:
Foraminiferal chalk ooze, white (N9) to bluish white (5 B 9/1), moist, firm
and compact. Carbonate content very high. Coarse fraction about 6070%, consisting of abundant planktonic foraminifera, rare quartz,
benthonic foraminifera, pteropods, echinoid spines, sponge spicules
and diatom. Basal contact a sharp change in color and texture. 232-269
cm: Foraminiferal marl ooze, grayish orange pink (5 YR 7/2) to grayish
orange (10 YR 7/4), moist, firm and locally laminated. Carbonate
content high to very high. Coarse fraction about 60%, consisting of
abundant planktonic foraminifera, rare benthonic foraminifera, diatoms,
sponge spicules, echinoid spines, quartz, mica and manganese
micronodules. Basal contact a sharp change in composition. 269-292
cm: Foraminiferal chalk ooze, similar in all aspects to zone between
125-232 cm. Basal contact a sharp change in color. 292-563 cm:
Interbedded foraminiferal marl ooze and foraminiferal chalk ooze,
grayish orange pink (5 YR 7/2) to very pale orange (10 YR /2), moist,
firm and interbedded. Carbonate content high to very high. Coarse
fraction about 50%, consisting of abundant planktonic foraminifera, rare
diatoms, benthonic foram inifera, sponge spicules, echinoid spines,
quartz and mica. Zone locally exhibits flow structures. Basal contact a
sharp change in texture. 563-899 cm: Interlaminated foraminifera chalk
ooze and foraminiferal marl ooze, very pale orange (10 YR 8/2) to
grayish orange pink (10 YR 8/2), moist, firm and laminated. Carbonate
content and coarse fraction similar to zone between 292-563 cm.
Sediment is locally folded. Trigger Weight Date described: 28 March
1974 Described by: C. Perissoratis 0-55 cm Foraminiferal ooze,
moderate yellowish brown (10 YR 5/4) to pale brown (5 YR 5/2), moist
and firm. Carbonate content high. Coarse fraction about 80-90%,
consisting of abundant planktonic foraminifera, rare benthonic
foraminifera, echinoid spines, sponge spicules. quartz, mica, dark
minerals and pteropods. NOTE: Trigger core is generally similar to the
top of the piston core._
RIDGE CREST – 1500m
Visual Core Description for VM22-224
Date described: 10 April 1968 Described by: F. Maurrasse 0-54 cm:
Breccia, grayish orange (10YR7/4) to olive black (5Y2/1), moist and
very crumbly. Carbonate content high throughout. Coarse fraction 60%
to 95%, contains mainly high angular obsidian and quartz fragments,
increasing toward the bottom. Biogenous constituents comprise about
40% of the sediment at the top and 10% at bottom. Planktonic
foraminifera dominate throughout and some benthonic foraminifera
occur scattered from 18 cm. In addition, pteropods and sponge spicules
are also common, whereas Radiolaria and diatoms are very rare.
Neither paper nor pipe were labeled Top-Bottom. Have assumed that
most compact breccia (which probably stopped penetration) was bottom
of core. Shipboard log denotes method of extrusion poured from bottom.
Trigger Weight Date described: 4 May 1971 Described by: D.
Richardson 0-6.5 cm: Sandy marl, very pale orange (10 YR 7.5/2),
speckled with black spots, hard, dry and homogeneous. Carbonate
content moderate. Coarse fraction 20%, consisting of volcanic glass
shards, benthonic and planktonic foraminifera (mainly small forms),
quartz and various dark minerals. Basal contact a gradual color and
textural change 6.5-18 cm: Sandy marl, very pale orange (10 YR 7/2),
hard, dry and homogeneous. Carbonate content moderate. Coarse
fraction 10%, consisting of volcanic glass shards, benthonic and
planktonic foraminifera, quartz and various dark minerals._
ICE-RAFTED DETRITUS, N. ATLANTIC
Visual Core Description for VM28-16
Date described: 9 April 1971 Described by: R. Krauser 0-61 cm: Clayey
sand, very dark yellowish brown (10 YR 3/2) firm, moist and burrowed .
Carbonate content nil. Coarse fraction about 60%, consisting of quartz
(dominant), basic rock fragments, feldspar, rare basic glass and rare
sponge spicules. Basal contact a sharp change in texture and
compaction. 61-62 cm: Clayey sand, very dark yellowish brown (10 YR
3.5/2.5), moist and slightly crumbly. Carbonate content nil. Coarse
fraction about 50%, consisting of quartz (dominant ), basic rock
fragments and rare sponge spicules. Basal contact a sharp change in
color and texture. 62-70 cm: Clayey sand, very dark yellowish brown (10
YR 3/2). Similar to zone at 0-61 cm. Basal contact a sharp change in
color and texture. 70-73 cm: Clayey sand, very dark yellowish brown (10
YR 3.5/2.5). Similar to zone at 61-62 cm. Basal contact a sharp change
in color and texture. 73-141 cm: Clayey sand, very dark yellowish brown
(10 YR 3.5/2), firm, moist and apparently homogeneous. Carbonate
content very low. Coarse fraction about 50%, consisting of quartz
(dominant), planktonic foraminifera, and rare basic rock fragments.
Basal contact a sharp color change. 141-146cm: Sandy clay,
intermediate between dark gray (N3) and dark olive gray (5 Y 3/1) firm,
moist and homogeneous. Carbonate content very low. Coarse fraction
about 15%, consisting of quartz, rare basic rock fragments and rare
planktonic foraminifera. Basal contact a sharp color change. 146-150
cm: Clayey sand, very dark yellowish.brown (10 YR 3/2). Similar to zone
at 0-61 cm. Trigger Weight Date described: 27 July 1971 Described by:
R. Baker 0-9 cm: Silty clay, between pale yellowish brown (10 YR 6/2)
and moderate yellowish brown (10 YR 5/4), dry, crumbly, broken into
chunks. Generally homogeneous and structureless. Carbonate content
very low. Coarse fraction 5%, consisting primarily of abundant quartz
and mafic mineral grains, occasional mica flakes and sponge spicules
and rare benthonic foraminifera. NOTE: The trigger core and piston core
compare well in lithology. The trigger core is too fragmented to correlate
stratigraphically with the piston core._
DIATOMACEOUS OOZE
Visual Core Description for RC13-269
Date described: 1 October 1971 Described by: P.J. Ledman GENERAL:
Diatomaceous-foraminiferal ooze (yellowish gray), diatomaceous ooze
(grayish orange), sandy diatomaceous ooze (olive gray), sandy
diatomaceous clay (olive gray), sandy radiolarian clay (olive gray) and
sandy radiolarian-diatomaceous clay (light olive gray), moist and firm,
upper segments of core stretched. Carbonate content low to moderate.
Coarse fraction consists of diatoms, Radiolaria, planktonic foraminifera,
volcanic glass, quartz, benthonic foraminifera, dark minerals, shell
fragments, sponge spicules, echinoid spines and some pumice. 0-100
cm: Diatomaceous-foraminiferal ooze, yellowish gray (5 Y 8/1), moist,
firm and stretched. Moderate carbonate content. Coarse fraction above
62 microns about 50%, consisting primarily of diatoms, planktonic
foraminifera, with quartz, benthonic foraminifera, Radiolaria and dark
minerals. Basal contact a gradational color and textural change. 100140 cm: Diatomaceous ooze, grayish orange (10 YR 7/3), moist, firm
and stretched. Carbonate content low. Coarse fraction above 62
microns about 75%, consisting of diatoms, with planktonic foraminifera,
Radiolaria, dark minerals and quartz. Basal contact a gradational color
change. 140-185 cm: Sandy diatomaceous ooze, olive gray (5 Y 5/1),
moist, firm and stretched. Carbonate content low. Coarse fraction above
62 microns about 50%, consisting of diatoms and volcanic glass, with
Radiolaria and planktonic foraminifera. Basal contact a gradual change
in texture. 185-230 cm: Sandy diatomaceous clay, olive gray (5 Y 5/1),
moist, firm and stretched. Carbonate content low. Coarse fraction 25%,
consisting of diatoms and volcanic glass, with planktonic foraminifera
and Radiolaria. Basal contact a disturbed color change 230-260 cm:
Sandy diatomaceous clay, olive gray (5 Y 7/1), moist and firm.
Carbonate content low. Coarse fraction 25%, consisting of diatoms and
volcanic glass, with Radiolaria, quartz and sponge spicules. Basal
contact a gradational color change. 260-341 cm: Sandy diatomaceous
clay, olive gray (5 Y 6/1), moist and firm. Carbonate content low. Coarse
fraction above 62 microns about 25%, consisting of diatoms and
volcanic glass, with Radiolaria. Basal contact a sharp, disturbed color
change. 341-369 cm: Diatomaceous ooze, yellowish gray (5 Y 7/1),
moist and firm. Carbonate content low. Coarse fraction above 62
microns about 50%, consisting primarily of diatoms, with volcanic glass,
quartz and planktonic foraminifera. Basal contact a disturbed color
change. 369-383 cm: Sandy diatomaceous clay, olive gray (5 Y 6/1),
moist and firm. Low carbonate content. Coarse fraction above 62
microns about 25%, consisting of diatoms and volcanic glass, with
Radiolaria. Basal contact a sharp change in color and texture. 383-461
cm: Diatomaceous ooze, very pale orange (10 YR 8/2), moist and firm.
Carbonate content low. Coarse fraction above 62 microns about 60%,
consisting primarily of diatoms, with Radiolaria, planktonic foraminifera
and a negligible amount of shell fragments. Basal contact a sharp
change in color and texture. 461-592 cm: Sandy radiolarian clay, olive
gray (5 Y 4/1), moist and firm. Carbonate content ow. Coarse fraction
above 62 microns about 25%, consisting of volcanic sand and
Radiolaria, with diatoms, sponge spicules and quartz. Basal contact a
sharp color change. 592-611 cmSandy radiolarian-diatomaceous clay,
light olive gray (5 Y 5/1), moist and firm. No carbonate content. Coarse
fraction above 62 microns about 25%, consisting of Radiolaria, diatoms,
volcanic glass and quartz. Basal contact a sharp color and textural
change. 611-630 cm: Diatomaceous ooze, very pale orange (10 YR
8/2), moist and firm. Carbonate content low. Coarse fraction above 62
microns about 50%, consisting of diatoms, with volcanic glass and
Radiolaria. Basal contact a disturbed color and textural change. 630728 cm: Sandy diatomaceous clay, olive gray (5 Y 5/1), moist and firm.
No carbonate content. Coarse fraction 10% grading to 25%, consisting
primarily of diatoms and volcanic glass, with Radiolaria, quartz and
sponge spicules. Basal contact a burrowed change in color and texture.
728-812 cm: Diatomaceous ooze, very pale orange (10 YR 8/2), with a
zone of yellowish gray (5 Y 8/1) at 759-778 cm, moist and firm. No
carbonate content. Coarse fraction above 62 micrnns about 50%,
consisting primarily of diatoms. Basal contact a gradational change in
color and texture. 812-908 cm: Sandy radiolarian clay, moderate olive
brown (5 Y 4/4) grading to olive gray (5 Y 4/1), moist and firm. No
carbonate content. Coarse fraction about 5-10%, consisting of
Radiolaria, quartz, volcanic glass, echinoid spines and negligible
diatoms. Pumice fragments (1 mm) scattered throughout. Basal contact
a disturbed change in color and texture. 908-951 cm: Diatomaceousforaminiferal ooze, yellowish gray (5 Y 8/1), moist and firm. Moderate
carbonate content. Coarse fraction about 50%, consisting of planktonic
foraminifera, diatoms and some Radiolaria. Basal contact a slight
change in color. 951-1094 cm: Diatomaceous ooze, very pale orange
(10 YR 8/2), moist and firm. No carbonate content. Coarse fraction
about 50%, consisting of diatoms, with Radiolaria and planktonic
foraminifera. Fragment of lithified chalk occurs at 1091-1094 cm._