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Earth 7

name: ______________________________
Across
Age of Reptiles
index fossil that lived about 400 million years ago
process in which minerals replace an organsim's tissues
index fossil similar to a modern squid that lived between 230 and 208 million years ago
visible light
cavity made in a sediment surface after an organism decays
process in which the pores in an organism's hard tissue is filled with minerals
Age of Amphibians
the current epoch
middle life
Down
hardened tree sap
Age of Mammals
most recent eon
evidence of an organism's activities
recent life
the current period
petrified feces
solid outer replica of an organism formed when sediments or minerals fill in a cavity
ancient life
tubular or cylinder-shaped sample of ice