Tonto National Forest Devonian Project

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Fossil of primitive fish Asterolepis in foreground, with life reconstruction behind.


Museum Researchers: Principal Investigator Adjunct Curator Dr. Heidemarie Johnson
Location: Near Payson
Age: Middle to Upper Devonian, 380 million years before present
Geological Unit: Martin Limestone
Discoveries Include: The ancient fishes, Asterolepis, Bothriolepis, Arthrodira.
Comments: The beds containing the fish, Asterolepis apparently represent a mass death in a drying pond or ox bow lake, not far from the ancient ocean that covered much of Arizona.

Publications from Tonto National Forest Devonian Project 

2001 In Search of Clues: Solving the Mystery of a 375 million year old Mass-Kill.
Heidemarie G. Johnson. Mesa Southwest Museum Bulletin 8:1.
2000 A New Antiarch (Class Placodermi) from Arizona.
Heidemarie G. Johnson (abstract). Mesa Southwest Museum Bulletin 7: 1.
1995 Devonian Fossil Fish from Central Arizona.
Heidemarie G. Johnson. Fossils of Arizona Symposium Proceedings Volume 3:1-6.