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by BlastRoom
Use fossil evidence and marker beds to correlate rock layers between separated outcrops.
#earth_space_science
40 questions
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Use the outcrop diagram. What conclusion is best supported by the repeated ammonite fossil symbol?
Use the comparison table. Which organism would make the best index fossil for correlating beds across a continent?
A bed contains fossils P and Q. Using the range chart, during which period was the bed deposited?
Two sandstone beds look alike, but one contains fossil M and the other fossil N; the range chart shows M and N never overlapped. What is the best correlation?
In the outcrop diagram, the same trilobite symbol appears in one bed at each location. Which beds should be correlated?
A fossil species lived for 80 million years and is found worldwide in many rock layers. Why is it a weak index fossil?
A limestone contains fossils X and Y. Use the range chart to identify the period when the limestone formed.
The same volcanic ash marker bed is shown in two outcrops. Which listed unit is youngest?
Use the outcrop diagram. Which pair of beds is the best match in age based on the graptolite symbol?
Use the table of four fossil species. Which species has the strongest index-fossil traits?
A shale bed contains fossils A and B. Use the range chart to date the shale.
Outcrop 1 has a shale with fossil F; outcrop 2 has a limestone with the same fossil F. What evidence matters most for correlation?
Use the three-outcrop diagram. Which beds are most likely the same age?
A bed contains fossils R and S. Use the range chart to bracket its age.
A sandstone bed contains fossil L. Use the range chart to choose the narrowest possible age for the bed.
A marker ash bed crosses the two outcrops. Which event happened first?
In the outcrop figure, a crinoid fossil symbol repeats at the three sites. What do the marked beds share?
Use the table. Which trait would make Species C less useful as an index fossil than Species A?
A bed contains fossils D and E. Use the range chart to determine the bed's age.
Limestone formed in shallow seas many separate times in Earth's history. Why is matching two limestone beds by rock type alone risky?
Use the outcrop diagram. Which correlation is supported by the matching brachiopod symbol?
The same ash marker bed appears in both outcrops. Which layer is older than the ash?
Use the range chart. Fossil G is found alone in a bed. What is the narrowest age assignment shown?
A bed contains fossils U, V, and W. Use the range chart to bracket its age.
Use the outcrop diagram. Which beds should be matched using the fern fossil symbol?
A fossil is common and easy to identify but occurs only in one small reef system. What limits its use for long-distance correlation?
The same bentonite ash bed is present in both columns. Which sequence at outcrop A is oldest to youngest?
Use the rock columns. The shale beds in outcrops X and Y look alike, but their fossils have age ranges that do not overlap. Which conclusion best weighs fossil evidence against matching rock type?
Use the outcrop diagram. Which correlation is best supported by the coral fossil symbol?
A siltstone contains fossils J and K. Use the chart to bracket the bed's age.
A bed contains fossils N and O. Use the range chart to find when the bed formed.
Two outcrops contain identical sandstone beds. One bed has fossil A, which lived only in the Devonian. The other has fossil B, which lived only in the Mississippian. Which statement is correct?
Use the range chart. A bed has fossils C and D but not E. During which period was it deposited?
Use the outcrop diagram. Which beds have the same relative age based on the clam fossil symbol?
Which fossil species would be the poorest choice for correlating rock units across states?
A bed contains fossil T. Use the range chart to choose the bed's most likely age.
The ash marker bed is the same in both outcrops. Which unit must be younger than the ash?
Use the outcrop diagram. Which set of beds should be correlated by the snail fossil symbol?
Two columns are tied by the same ash marker bed. Which unit is oldest among the listed choices?
A geologist wants an index fossil for a short interval within the Paleozoic. Which trait is most important for narrowing the age?
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The Geologic Time Scale
50 questions
