Unearthed in Arctic Canada , Tiktaalik is technically a fish, complete with scales and gills — but it has the flattened head of a crocodile and unusual fins. Its fins have thin ray bones for paddling like most fish, but they also have sturdy interior bones that would have allowed Tiktaalik to prop itself up in shallow water and use its limbs for support as most four-legged animals do. Those fins and a suite of other characteristics set Tiktaalik apart as something special; it has a combination of features that show the evolutionary transition between swimming fish and their descendants, the four-legged vertebrates — a clade which includes amphibians, reptiles, birds and mammals. It and similar animals may possibly be the common ancestors of the broad swath of all vertebrate terrestrial fauna : amphibians, reptiles, birds, and mammals.
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Geology relative dating exercise, who's on first? relative dating (student activity)
WHO'S ON FIRST? A RELATIVE DATING ACTIVITY
Relative dating worksheet with answers. Read the lab materials and define the following terms and concepts answer the questions. Relative dating worksheet answers is manageable in our digital library an online admission to it is set as public for that reason you can download it instantly. Using the diagram below which of the following. The cross cutting law. Dig deep to learn how scientists use relative dating of rock layers to determine earth s age.
1. EXERCISE 7: HISTORICAL GEOLOGY AND FOSSILS
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Click here to access the activities related to the interpretation of geologic sequences. The two intrusions are labeled as X and Z; the surrounding rock called the "country rock" is labeled as D. We have seen that a cliff or a road cut is a local "geologic cross-section" -- a side view of the geology at one location. You do not need to complete the second half of this particular exercise about resolving these ambiguities in the relative dating.