WebAn ancient three-dimensional star-shaped 'thing' still baffles scientists more than a century after its discovery. First described in 1896 by American paleontologist Charles Doolittle Walcott as a kind of jellyfish, a number of similar radial forms have since been found in various shale deposits dating back half a billion years ago to the Cambrian. Webfossil ammonites! Some have ammolite, or a fiery play of color like opal. The interior shows the chambers inside the shell, and some have tiny crystal lined openings and some even …
Hexactinellida (Glass Sponges) Encyclopedia.com
WebName: Porifera, Class Hexactinellida (glass sponge fossil) Age: Lower Devonian, Seigenian/Emsian Stage. Size: (25.4mm=1 inch): 192 mm long, 38 mm across on a 180 … WebOct 19, 2013 · Living Undersea Fossils For decades, scientists knew glass sponge reefs only as Mesozoic-era fossils from about 160 million years ago. These reefs once carpeted a 4,350-mile... charging symbol on macbook pro
CNN - Paleontologists hunt for mystery fossil - April 15, 1999
Hydnoceras specimens are typically around 8.375 inches long, and about 3.5 inches wide. 8 pronounced ridges run down along the length of the sponge and are crossed by horizontal ridges, producing conical swellings at intersections. Hydnoceras fossils' entire surfaces are typically covered by coarse and fine rectangular patterns of narrow, threadlike ridges. The threadlike ridges are produced as a result of the way in which these sponges usually fossilized. Hydnoceras spec… WebFeb 23, 1999 · Around the same time, glass sponge-like fossils labeled Protoarmstrongia ithacensis were found in an rock quarry near Ithaca; these were dated to the Devonian period, about 365 million years ago. Both … Webfossil. We found that Brooksella lacked characteristics of glass sponges, specifically, the opaline-fused spicules that compose the body. Nor did it grow as a sponge would be expected to over its ... harrow boxing