GEOLOGY CMU Bill Palmer Lecture 16 Missouri Geology GEOLOGY Goals Learn about Missouri Geology. Learn about some cool places you might want to visit. GEOLOGY-Rocks Igneous Rocks-Rhyolite Earth is 4.6 BYO Oldest rocks in MO are Rhyolite-2-3 BYO Rhyolite-cooled at two different rates Found in St. Francois Mtns. Pyroclastic -Volcanoes (think Mt. St. Helens) GEOLOGY-Rocks Igneous Rocks-Granite After the Rhyolite there were intrusions of magma The magma cooled slowly forming Granite Most MO granite is pink-red Several periods 1.2-1.5 MYO GEOLOGY-Rocks Igneous Rocks-Basalt After the granite, Basalt dikes cut through the granite Much younger-only 1 MYO GEOLOGY-Rocks Igneous Rock Characteristics Weather slowly This slow erosion forms mountains, hills, and knobs These ancient igneous rocks plunge deep into the earth and are thought to lie under the entire state at great depths GEOLOGY-Rocks Sedimentary Rocks Composed of fragments of previously existing rocks or chemical deposition Many sedimentary rocks in MO MO alternately submerged and exposed many times 500 MYA Limestone, dolostone, shale, sandstone Most natural rocks N of MO river are sedimentary GEOLOGY-Rocks Sedimentary Rocks Formation is a uniform rock unit that can be recognized over a large area “Type Section” is locality where a formation is first described This allows a geologist to go to the original site to compare to a known standard GEOLOGY-Rocks Sedimentary Rocks Missouri has several type sections: Jefferson City Dolomite-found on MO River bluffs on N side of river Bonneterre Dolomite-host rock for most of MO lead Gasconade Dolomite-Rich in caves Eminence Dolomite-Rich in caves Burlington (IA) Limestone-Crushed Rock Warsaw Limestone-cut and sold as Carthage Marble GEOLOGY GEOLOGY-Rocks Metamorphic Rocks Forget it! Zero! Nada! None! GEOLOGY-Natural Divisions Missouri 1. has four main Natural Divisions: Ozarks 2. Southeast Lowlands 3. Western Plains 4. Northern Glaciated Plains GEOLOGY-Natural Divisions Ozarks Rugged hilly Country Rock layers are relative flat, tipping gently away from the St. François Mtns. Repetitive uplift and erosion About 1,000-1,200 ft. above sea level GEOLOGY-Natural Divisions Ozarks Deep valleys Good for building reservoirs-Lake of the Ozarks Old river meanders give these lakes long shorelines with many coves Rejuvenated Rivers GEOLOGY-Natural Divisions Ozarks Great MO Unconformity-100 MY of rocks missing GEOLOGY-Natural Divisions Southeast Lowlands “Bootheel” Flat as a board Lowest point in state-St. François River leaves the state at 230 ft. above sea level Big Oak Tree State Park is characteristic GEOLOGY-Natural Divisions Big Oak Tree State Park Southeast Lowlands GEOLOGY-Natural Divisions Western Plains Layers of sandstone, shale, coal, petroleum bearing sandstone Flat topography Springfield Plateau, Osage Plains Prairie State Park is in this area GEOLOGY-Natural Divisions Western Plains Prairie State Park GEOLOGY-Natural Divisions Northern Glaciated Plains Fairly flat topography Most of MO N of MO River Covered at least twice by continental glacier ice sheets Glacier meltwater carved much of path of MO River Left behind rock and boulders know as glacial till GEOLOGY-Natural Divisions Northern Glaciated Plains Great farmland due to till left by glaciers. GEOLOGY-Igneous Features Igneous Features Taum Sauk Mtn. Elephant Rocks Johnson’s Shut-Ins Basalt Dikes GEOLOGY-Rocks Taum Sauk Mtn. Taum Sauk State Park is highest point in state-1,772 ft above sea level. GEOLOGY Taum Sauk Power plant is really on Proffit Mountain. This Dam failed and trashed Johnson’s Shut-Ins State Park. The case is still in court. Watch news for settlement details. GEOLOGY-Rocks Granite Boulders about 1.5 MYO Elephant Rocks State Park GEOLOGY-Igneous Features Johnson’s Shut-Ins State Park Rhyolite about 2-3 BYO GEOLOGY-Igneous Features Basalt dike in MO road cut. The basalt is only 1 BYO. GEOLOGY-Waterfalls Waterfalls Westin Crown Center Waterfall Mina Sauk Falls GEOLOGY-Waterfalls Westin Crown Center Waterfall, Kansas City, MO About 50 ft. High. Visit this geologic feature in air conditioning and no bugs. GEOLOGY-Waterfalls Upper Mina Sauk Falls Lower Mina Sauk Falls Highest waterfall in Missouri. 132 feet. GEOLOGY-Rocks and Bluffs Rocks and Bluffs Loess Hills Pinnacles-Boone Co. Slave Rock-I-70, Montgomery Co. GEOLOGY-Rocks and Bluffs Loess hills are formed from wind blown particles at the end of the last ice age. Some in Boone Co; Most in NW MO. Loess Hills in NW MO GEOLOGY-Rocks and Bluffs Pinnacles-N of Columbia 70 feet High Burlington Limestone Crinoids GEOLOGY-Rocks and Bluffs Slave or Picnic Rock I-70 Montgomery County Windblown sand filled a sinkhole and then softer rocks eroded leaving a big round sandstone rock. Slaves were sold here in 1800s GEOLOGY-Karst Karst Karst-an area of caves, springs, sink holes, natural bridges all formed by the action of water dissolving rock. Karst is an area in Yugoslavia. HaHaTonka State Park Rock Bridge Memorial State Park GEOLOGY-Karst HaHaTonka Spring HaHaTonka is said to mean “Laughing Waters.” HaHaTonka State Park GEOLOGY-Karst Scottish Castle Natural Bridge A wealthy Kansas City man built a Scottish Castle here. Burned in 1917. Only walls remain. GEOLOGY-Karst Devil’s Icebox Cave at Rockbridge Memorial State Park. This cave is in Burlington Limestone. GEOLOGY- Caves Show Caves Onondaga Cave State Park Meramec Caverns GEOLOGY-Caves Queen’s Canopy Lilly Pad Room The Twins Onondaga Cave State Park. State operated on Meramec River GEOLOGY-Caves Meramec Caverns Commercial cave; famous throughout USA due to “barn signs.” Frank and Jesse James GEOLOGY-Great Springs Geologic Wonders and Curiosities-Springs Big Spring Alley Spring Greer Spring Blue Spring GEOLOGY-Great Springs Big Springs feeds water to the Current River. Big Spring Largest in State 840m gal/day GEOLOGY-Great Springs Big Spring Enough dolostone is dissolved by the spring each year to make a cave passage 30ft high, 50ft wide, and 1 mile in length. Our descendants will have a tremendous cave to explore when the Current River drains the spring. GEOLOGY-Great Springs 32 ft deep Alley Spring 685m gal/day GEOLOGY-Great Springs 583m gal/day Greer Spring 2nd Largest 100+ ft deep GEOLOGY-Great Springs Deepest spring-256 ft. Blue Spring 6th Largest 90m gal/day Geology-Great Rivers Great Rivers Current and Jack’s Fork Meramec Eleven Point Missouri-Mississippi Geology-Great Rivers Caution-Don’t Flip Current RiverOzark national Scenic Riverways. NPS-operated Eminence Dolostone Geology-Great Rivers Gasconade Dolostone Bluff Meramec RiverMostly private land. Green’s Cave Geology-Great Rivers Eleven-Point River USFS operated Geology-Great Rivers Missouri River KATY Trail Canoeing MO River Big Manitou Bluffs Pictographs Les Bourgeois Winery GEOLOGY Geologic Trivia-The Devil must have loved MO 80+ place names feature “Devil” 25 Devil’s Backbones 8 Devil’s Den 4 Devil’s Boot 2 Devil’s Cave Devil’s Icebox Devil’s Sugar Bowl And about 40 more GEOLOGY Geologic Trivia Highest Point=Taum Sauk Mtn. 1772 feet Lowest point=St. Francois River-230 ft Deepest Road Cut=150 ft. Hwy, 65, 8 ml. North of Branson State Rock=Mozarkite State Fossil=Crinoid State Mineral=Galena Chert is probably Missouri’s most common rock GEOLOGY-Wrap Ups 1. How old are the oldest rocks in Missouri and where are they found? 2. Which has the older rocks-Johnson’s Shut-Ins SP or Elephant Rocks SP? 3. Where are the St. Francois Mountains of MO? 4. What is the highest point in Missouri? Elevation? 5. Give an age for sedimentary rocks in Missouri? GEOLOGY-Wrap Ups 6. Where do you find most of the sedimentary rocks in Missouri? 7. Name four sedimentary rocks found in Missouri. 8. What is a “type section?” 9. What kind of rock is found in the Jefferson City Formation? 10. What rock section provides high quality crushed limestone? GEOLOGY-Wrap Ups 11. Where are metamorphic rocks found in Missouri? 12.What are the four Main Natural Divisions of Missouri? 13. Name a site associated with each Natural Division. 14. What is a “Shut-Ins?” Name one. 15. Name the highest waterfall in MO, its height, and location. GEOLOGY-Wrap Ups 21. Who operates the Ozark National Scenic Riverways? 22. What is the lowest point in Missouri and where is it? 23. What is the state rock? 24. What is the state mineral? 25. What is the state rock?