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Possible new evidence for the origin of metazoans prior to 1 Ga: Sediment-filled tubes from the Mesoproterozoic Allamoore Formation, Trans-Pecos Texas

¹ Department of Geology, Texas Christian University, Fort Worth, Texas 76129

Possible new evidence for the origin of metazoans prior to 1 Ga comes from sediment-filled tubes preserved on a bedding-plane parting in a chert in the Allamoore Formation (Mesoproterozoic) in a talc quarry in the Millican Hills, near Van Horn, Trans-Pecos Texas. Available data for the Van Horn region indicate that the age of the Allamoore Formation is 1250 Ma. The sediment-filled tubes are most likely the feeding traces of animals grazing on algal mats in shallow subtidal or intertidal environments.

This article has been cited by other articles:

				S. Bengtson, B. Rasmussen, and B. Krapez The Paleoproterozoic megascopic Stirling biota Paleobiology, June 1, 2007; 33(3): 351 - 381. [Abstract] [Full Text] [PDF]