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Paleontology Weekly's Puzzle!

Across
A unit of geologic time
A mark or cavity made in sedimentary rock by a shell or other body parts
The action or process of making a copy of something
Diversity among and within plant and animal species in an environment
Principle that states that sediments will be deposited in horizontal layers
A way in which organisms are fossilized and preserved in sticky tree sap
Any method of determining whether an event or object is older or younger than another
The death of every member of a species.
Down
A trace or remains of organisms that lived long ago
The principle that states that younger rocks lie above older rock if the layers have not been disturbed
The current era "Age of Mammals"
A fossil that is found in rock layers from only one geologic age and is used to establish the age of the rock
Any method of measuring the age of an event or object in years
A type of fossil that forms when sediments fill in the cavity left by a decomposed organism
Any process of formation or growth