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Article Title

The Spiral Trace Fossil Gyrolithes de Saporta, 1884 in the Pliocene Tirabuzon Formation Near Santa Rosalia, Baja California Sur, Mexico

Volume

84

Issue

2

First Page

57

Last Page

66

Abstract

The spiral trace fossil Gyrolithes de Saporta, 1884 in the Pliocene Tirabuzon Formation near Santa Rosalia, Baja California Sur, Mexico, by Edward C. Wilson. Bull. Southern California Acad. Sci., 84(2):57-66, 1985. The largest recorded specimens of the enigmatic spiral trace fossil Gyrolithes are abundant in the Pliocene Tirabuzon Formation near Santa Rosalia, Baja California Sur, Mexico. They grade gradually into Thalassinoides-type burrows. Both types of burrows are lined by scratch marks, suggesting excavation by a decapod crustacean. Associated mollusks indicate a depth of 55 to 90 m.