Exam Review GEOL 1304

Exam Review GEOL 1304 - 8/25 8/279 8/279 8/279 Index Fossil...

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Unformatted text preview: 8/25 8/279 8/279 8/279 Index Fossil 9/5 9/5 9/7 9/10 9/10 Subduction 9/15 9/19 Mold (dissolves) Cast 9/22 9/22 9/24 9/26 9/26 9/29 Contrasting Ideas 66 my Neogene Paleogene Cretaceous Jurassic Triassic 251 my Permian Carboniferous/Miss/Penn Devonian Silurian Ordovician Cambrian 545 my EXAM REVIEW GEOL 1304 – 001 Uniformitarianism o Physical processes that don’t change with time “Laws of nature” don’t change through time o “The present is the key to the past” – used to describe but semi-contrasting to definition o (ex) Gravity • Actualism o Processes active today that have been active in the geologic past Observing patterns with different products o “The present is the key to the past” – more closely related to definition Catastrophism o Incidents that are unnatural and not repeatable, but have a natural explanation (uniformitarianism) ROCK CYCLE • Igneous Magma (extrusive) Lava (intrusive) → → o Extrusive (on the surface) – cools fast, small crystals o Intrusive (in the subsurface) – cools slow, big crystals • 1. After uplift and erosion, weathering (breakdown rock and minerals) o Erosion: 1. Take products of weathering and move them 2. Transportation of weathering products • 2. After transportation, sediments are deposited • 3. After burial and cementation, sedimentary rocks are formed • 4. After heat and pressure, metamorphic rocks are formed (Will work on igneous rocks too) STRATIGRAPHY • Stratigraphy o The relationship of sedimentary rocks on space and time • Stratigraphers (legal) o Formal rock units, keepers of time peace • Stratigraphers (science) o The why of the sedimentary rock record • Concept of Stratigraphy o Steno’s Law (1660’s) 1. Super positioning • Oldest material at bottom, younger material at top 2. Original Horizontality • Sedimentary rock bodies were deposited as big sheets 3. Original lateral continuity • Sheet-like, continuous bodies • Fossils Succesion (Super positioning) → Wide range ecology o Few layers/beds (restricted range) CYCLES IN THE EARTH HISTORY • Rock Cycle • Plate Tectonic Cycle o Wilson Cycle (500 my Cycle) o Super Continent Cycle 1. Continents drift apart 2. Continents collide back together2....
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Exam Review GEOL 1304 - 8/25 8/279 8/279 8/279 Index Fossil...

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