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The Pennsylvanian Climate Gone Wild

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The Pennsylvanian Climate Gone Wild Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana The Pennsylvanian Climate gone wild P. David Polly Department of Geological Sciences Indiana University Bloomington, Indiana 47405 USA [email protected] Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana Objectives 1. Pennsylvanian paleogeography and rock units; 2. Terrestrial life in the Pennsylvanian; 3. Early land plants, lepidodendron forests, Pennsylvanian biomes; 4. Coal and its formation; 5. Transgression, regression, and cyclothems; 6. Carbon and oxygen cycles and the effects of plant burial on atmospheric composition; 7. Cyclothems and an Ice Age in the Pennsylvanian. Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana The Late Pennsylvanian (300 mya) Gondwana Ice Caps Equatorial view, Western Hemisphere Reconstruction by Ron Blakey http://jan.ucc.nau.edu/~rcb7/index.html Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana Pennsylvanian rock units Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana Tetrapods from Indiana Amphibian tracks left in the mud of a Pennsylvanian Age tidal flat in Martin County, Indiana. On display at Indiana Geological Survey. (photo by John Day) Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana Plants from Pennsylvanian of Indiana Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana Hurdles in the transition from water to land Vermeij and Grosberg (2010) Integrative and Comparative Biology, 50: 675-682. Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana Division Chlorophyta Division Lycophyta Club Green algae mosses Class Charophyceae Order Lycopodiales charophytes Lycopodium (living club moss) Division Sphenophyta horsetails Order Equisetales Division Anthophyta Equisetum flowering plants Division Coniferophyta conifers Division Bryophyta Division Pteridophyta Ferns Spaghnum Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana Plants have different scientific names for different morphological structures (Feldman et al., 1996. Fossils of Ohio) (Feldman et al., 1996. Fossils of Ohio) Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana Devonian Archaeopoteris A progymnosperm tree from eastern North America Archaeopteris Callixylon (Beck, C.B. 1962. Reconstructions of Archaeopteris. Am. J. Botany, 49: 373-382) (Beck, 1960. The identity of Archaeopteris and Callixylon. Brittonia, 12: 351-368) (Beck, C.B. 1962. Reconstructions of Archaeopteris. Am. J. Botany, 49: 373-382) Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana Catskill Delta Late Devonian (360 mya) Time of New Albany Shale Reconstruction by Ron Blakey http://jan.ucc.nau.edu/~rcb7/index.html Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana Callixylon logs (Archaeopteris) Late Devonian, New Albany Shale Smithsonian exhibit, photo by Michael Popp (2011) Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana Pennsylvanian ferns Pecopteris Pecopteris Pecopteris Greene County Knox County Pike County (Canright, 1959. Fossil Plants of Indiana. Indiana Geol Survey Report 14) Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana Pennsylvanian Horsetail trees (Sphenophyta) Palaeostachya (stems) Annularia Calamites Greene County Calamites (leaves) (trunk and whole plant) (Canright, 1959. Fossil Plants of Indiana. Indiana Geol Survey Report 14) Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana Lepidodendron trees (Lycophyta) Stigmaria Lawrence County Lepidodendron Lepidostrobus Orange County Greene County (Canright, 1959. Fossil Plants of Indiana. Indiana Geol Survey Report 14) Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana Pennsylvanian Lepidodendron Forests Cypress swamp in Arkansas (Zack Weinberg, 2006) Early stage forest Reproductively mature forest (DiMichele and DeMaris, 1987, Structure and dynamics of a Pennsylvanian-age Lepidodendron forest. Palaios, 2: 146-157.) Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana Pennsylvanian coastal biome Falcon-Lang et al., 2006. The Pennsylvanian tropical biome reconstructed from the Joggins Fm. of Nova Scotia, Canada. J. Geol. Soc., 163: 561-576. Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana Indiana Coal Pennsylvanian Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana Peat and the formation of coal Peat is accumulation of partly decayed vegetation, usually forming in some type of wetlands. (Hancock and Skinner, 2000. Oxford Companion to the Earth) Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana Transgression Regression Transgressive Regressive local section local section Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana Transgression and peat formation (Hancock and Skinner, 2000. Oxford Companion to the Earth) Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana Typical Illinois basin cyclothem A cyclothem is a mappable unit of rock made of beds of many rock types (usually limestones, sandstones, shales and often coals) that are too thin and complicated to subdivide. Usually deposited during transgression-regression cycles. •Coals usually form in transgressive sequences right at the paleo shoreline •Coals usually have fluvial sands and non-marine shales below them •Coals usually have marine shales and limestones above them (Riegel, 1991. Coal cyclothems and some models for their origin. Pp. 733-750 in Cycles and Events in Stratigraphy) Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana Rate of organic carbon burial through Phanerozoic (Berner and Canfield, 1989. A new model for atmospheric oxygen over Phanerozoic time. American Journal of Science, 289: 333-361) Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana Carbon and Oxygen cycles Effects of plant burial on atmospheric CO2 • Normally rate of burial of organically bound carbon is roughly equal to the rate at which it is released by weathering • Burial removes carbon from cycle, either in carbonates, coal, or other carbon-rich rocks. • Weathering of carbonates also decreases atmospheric CO2. Carbon dioxide in atmosphere prevents heat from radiating back into space. Low rates of burial, High rates of burial, increase in atmospheric CO 2 decrease in atmospheric CO2 Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana Atmospheric carbon dioxide through the Phanerozoic (Royer, Berner, Montañez, Tabor and Beerling, 2004. CO2 as a primary driver of Phanerozoic climate. GSA Today, 14: 4-10) Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana River channels in Pennsylvanian of Indiana Ice caps drop sea level, which exposes land (Friedman, 1960. Channel-fill sandstones in the Middle Pennsylvanian rocks of Indiana) Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana Pennsylvanian channel sandstones near New Goshen, Indiana (Friedman, 1960. Channel-fill sandstones in the Middle Pennsylvanian rocks of Indiana) Department of Geological Sciences | Indiana University Geol G-308 (c) 2012, P. David Polly Paleontology and Geology of Indiana Carboniferous events that triggered an ice age and cyclothem formation • Increasing diversity of plants from Devonian into Mississippian. • Warm, tropical temperatures in early Carboniferous (Mississippian) resulted in large carbonate platforms in the shallow seas and huge forested swamps on land, increased the O2 in the atmosphere and decreased the CO2 • Plants reduced CO2 in the earth’s atmosphere, but were being buried in anoxic swamp conditions. These became the Carboniferous coal deposits that are widespread around the world. • Reduced CO2 resulted in cooling (no ‘greenhouse effect’), which brought on major ice age, the coldest in earth’s history. • Position of massive Gondwana continent at south pole allowed large terrestrial ice caps to form • The effect was climate change and lowered sea levels. • Global temperature cool enough that Milankovitch astronomical cycles resulted in geologically cyclic glacial inter-glacial cycles like at present. • Cyclic rise and fall of sea level, resulting in cyclothems and coals..
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