Unformatted text preview: trace fossils are especially important b/c they tell us about behavior. ← how to fossilize a bone: • death followed by burial • permineralization - pore spaces in the bone are filled w/ minerals precipitated ground water • replacement - original material is replaced by other minerals. rare in bones, com-mon in wood. complete permineralization and replacement = petrification • 10,000 yrs min fossilization time ← Sedimentary rocks: formed in layers, derived from the weathering of pre-existing rocks, of precipitated from aqueous solution. igneous rocks: crystalized from liquid magma or lava metamorphic rocks: sedimentary rocks that have been physically and/or chemically altered by heat and/or pressure w/o melting. marine transgression - sea level is going up marine regression - sea level is going down...
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- Spring '08
- lava metamorphic rocks, solution. igneous rocks, tall @ hips