GEOL 112 Lab Final key terms

Fossils
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Terms in this set (30)
Fossils
The naturally preserved remains or traces of animals or plants that lived in the geologic past
Paleontology
is the study of fossils
Index fossils
fossils used to define and identify geologic periods
Unaltered fossils
no changes to hard parts (or soft parts if preserved)
Desiccation
mummification of fossilized organisms. Organisms are dried out and preserved
Replacement
Simultaneous exchange of the original hard part with mineral mater of another composition
Per-mineralization
minerals precipitate into the open spaces of hard parts
Mold
void where the organisms shell was originally
cast
infilling of void that shows the shells original form
colonial
animals that live in association with others rather than individual
non-colonialindividual organismPentameral symmetryfive rayed appearanceBilateral symmetryfive rayed appearanceRadial symmetrysymmetrical about a central pointCoiledcone or spiral shapePaleogeographic mapsreconstructions of depositional environmentsGeologic Mapsdistribution of geologic strata exposed on the earths surfaceFirst letterStands for the geologic system (period and epoch) it is a capital letterSecond letterdesignated the name of a specific mapped unit (group or formation) it is a lowercase letterAnticline- Strata bent into convex upward arch - older rocks in middleSyncline- strata bent concave upward - younger rocks in middleStrike- Direction of a formation (bed) in map view - Long line in the symbolDip-Angle and direction of a formation (bed) from horizontal in cross-section -Short line and degrees in the symbolPlate tectonicsMovement of the earth's lithosphere due to continental drift and seafloor spreadingEarth has three layers1. crust 2. mantle 3. coreLithosphereincludes crust and the lithospheric mantle above the MohoAsthenosphereUpper mantleMesosphereLower mantleOuter Coreliquid nickel- iron alloyinner coresolid nick - iron alloy