URL: Sponges from the Reef Trail Member of the Upper Guadalupian (Permian) Bell Canyon Formation, Guadalupe Mountains National Park, TexasAuthor Names: Rigby, J. KeithBell, Gorden L., Jr.Era/Period/Epoch: PermianDocument type: AbstractPublication Type: Journal/Periodical ArticlePublication Title: Journal of PaleontologyPublication Volume Number: 80Publication Issue Number: 66Page Numbers:: 1-42Year/month of publication: 2006-09Short title: Permian sponges of Texas