Fossils SOL #10.

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Presentation transcript:

Fossils SOL #10

Fossil Remains, impression, or other evidence preserved from preexisting life Hard parts of organism are more likely to fossilize than soft parts Most are found in sedimentary rock

Types of Fossils Mineral replacement Carbon film Mold & cast Minerals in soil replace soft parts in bones, teeth, or shells Carbon film Carbon imprint of item left behind Mold & cast Imprint in ground that gets filled in by sediment to form a cast Original remain Soft parts of item preserved Trace fossil Evidence of an organism (footprints) Trails & burrow Type of trace fossil

Index Fossils Fossils from species that were only around for a short period of time

Dating Fossils Relative age Absolute age Comparing ages (X is older than Z) Law of superposition-undisturbed layers of rock=older on bottom, younger on top Absolute age Age in # of years Radioactive decay

Radioactive Decay Break down of isotopes Alpha/Beta decay Half life Beta loose electron: alpha loose 2 n & 2 p Half life Time it takes for ½ atoms to decay Radiocarbon Dating Using C-14 to determine age of item

Unconformities Gaps in rocks Due to erosion or periods of time where no deposition occurred

Fossils in VA Mainly in Coastal Plains, Valley & Ridge, and App. Plateau Most are marine org. Paleozoic, Mesozoic, & Cenozoic Eras

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