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Mr. Dunce's Geologic Time Crossword Puzzle

Teacher: Aubrey Pamiroyan
Across
Animals without a backbone
An Ichthyosaur is an oceanic _______________ from the Triassic Period
A horned dinosaur
A division of time smaller than a period
The epoch humans currently thrive in
The period where giant horsetails, ferns, and seed-bearing plants thrived
Known as the "Age of Mammals"
An episode during which large numbers of species become extinct
Down
Era that contained the dinosaurs
Reef-like deposits formed by blue-green algae
Epoch with a cooler, drier climate and lots of grasses
Marine invertebrate in the Cambrian Period
Scorpion-like sea creatures in the Silurian Period
A nickname for the Devonian Period
A group of shelled animals
The era that marks the time span from 542 Ma to 251 Ma
Time frame that makes up 88% of Earth's history