GEOL 1003 Study Guide - Baltica, Cephalopod, Agnatha
Document Summary
Important concepts: firsts , defining the geologic time periods (silurian, devonian, biota (marine, terrestrial, mass extinction, geology (continental configuration, orogenic events, chemical reservoirs (atmosphere, eustasy, isotopic trends) Devonian (57 million: major orogenic events occurring, global eustatic changes. Unconformity formation: time of firsts in biosphere, silurian. Sea level rise and fall: flooding: widespread marine rocks on cratons. Colonization of land habitats: earl plants in silurian. Acadian orogeny: tilted deposits in england, devonian. Global cooling: marine diversification, rediversification of marine life after the ordovician mass extinction. Bivalve mollusks spread to non-marine habitats. Not all recovered: trilobites much less conspicuous in mid-paleozoic: reefs: coral-stromes re-flourished. Rugose (wrinkled, horned) outnumbered tabulate (tabulate internal structure: new nektonic (swimming) invertebrates (ammonoids, eurypterids, ammonoids. Evolved from coiled cephalopod mollusks (nautiloids) in the early devonian. Rapid diversification and dominance: excellent index fossils: devonian to late-mesozoic (extinction at kt boundary, eurypterids. Lived in brackish and freshwater: jawless fish diversified greatly during the silurian.
