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Showing results for tags 'percha formation'.
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This is a Late Devonian sponge collected from the Percha Formation found at the type locality on Brandenburg Mountain in Pinal County, Arizona. This sponge, has the largest complete head reported. Although mostly covered in calcareous sediments and maybe caliche it has the best preserved spicules of the species that I have seen; better than the photos in the Rigby reference below. First photo is a close up of the star shaped spicules that average 1 mm across. Second photo is of the top of sponge that is 70-75 mm across. First published in: Rigby, J Keith; Dietmar Schumacher; and Sally J. Meader. 1979. The genus Ensiferites, a Devonian astraeosponge of North America. Journal of Paleontology 53(2):475-493. Meader, Sally J. 1976. PALEOECOLOGY OF THE UPPER DEVONIAN PERCHA FORMATION OF SOUTH-CENTRAL ARIZONA. Master’s Thesis, DEPARTMENT OF GEOSCIENCES, UNIVERSITY OF ARIZONA, Tucson, Arizona. https://repository.arizona.edu/bitstream/handle/10150/566637/AZU_TD_BOX292_E9791_1976_329.pdf?sequence=1 Geological map: https://ngmdb.usgs.gov/Prodesc/proddesc_1977.htm
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I found another Ensiferites brandenburgi sponge that is now currently the largest ever found at 7 cm x 7.5 cm across. Part of the top displays lots of 1 mm spicules. Unfortunately the top of the calcareous sponge is mostly covered with caliche and possibly the limestone matrix. Is there any hope to prep this to expose all the spicules on the top? How? This could become a near museum piece thus I don’t want to practice my prepping skills in it. Help @Ptychodus04.
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This is a Late Devonian sponge collected from the Percha Formation found at the type locality on Brandenburg Mountain in Pinal County, Arizona. This sponge, although missing most of its stem, has the largest complete head reported. First photo is a close up of the star shaped spicules that average 1 mm across. Second photo is of the top of sponge that is 60-64 mm across by 20 mm thick. Zoom in the see numerous star shaped spicules. You can also see rod like sponge structures that look like villi when viewed from the top. First published in: Rigby, J Keith, Dietmar Schumacher, and Sally J. Meader. 1979. The genus Ensiferites, a Devonian astraeosponge of North America. Journal of Paleontology 53(2):475-493. Meader, Sally J. 1976. PALEOECOLOGY OF THE UPPER DEVONIAN PERCHA FORMATION OF SOUTH-CENTRAL ARIZONA. Master’s Thesis, DEPARTMENT OF GEOSCIENCES, UNIVERSITY OF ARIZONA, Tucson, Arizona. https://repository.arizona.edu/bitstream/handle/10150/566637/AZU_TD_BOX292_E9791_1976_329.pdf?sequence=1
