My Crossword Maker Logo
Powered by BrightSprout
Save Status:
or to save your progress. The page will not refresh.
Controls:
SPACEBAR SWITCHES TYPING DIRECTION
Answer Key:
Edit a Copy:
Make Your Own:
Crossword Word Search Worksheet
Rate This Puzzle:
Log in or sign up to rate this puzzle.

Permian Project

The Permian
by Sol Steiner
Across
The most primitive group of synapsids
An apex predator that lived in the early Permian, sporting a sail on it's back.
The first seed bearing plants
The largest mass extinction in history
Fish with bones instead of vertebrae
The ancestors of all reptiles; Identified by the either two or no openings in their skull.
The last epoch of the Permian
Down
Believed to be the ancestors of all mammals; Identified by their one opening behind the eye sockets.
The middle epoch of the Permian
The first epoch of the Permian
The branch of Synapsids that were the most closely linked to mamals