urban fossil Posted September 2, 2019 Share Posted September 2, 2019 Found this at Trout River, NWT amongst other fossils in an area that is supposedly Silurian period. Rock is only porous on one side. I have no idea if it is a fossil or if the rock has been through some sort of physical change. Let me know if higher res pictures are needed. All responses are appreciated. Link to comment Share on other sites More sharing options...
DPS Ammonite Posted September 2, 2019 Share Posted September 2, 2019 Those are molds/casts of bivalves/brachiopods. The holes occur when an unknown mineral (a carbonate such as calcite?) dissolved away. Please send higher res photos. My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
urban fossil Posted September 2, 2019 Author Share Posted September 2, 2019 Ok DPS Ammonite. An attempt at a closer look of the porous surface. Thanks for the help. I originally thought that there had been some other (abiotic) reason for the porous surface. Link to comment Share on other sites More sharing options...
DPS Ammonite Posted September 2, 2019 Share Posted September 2, 2019 37 minutes ago, urban fossil said: Ok DPS Ammonite. An attempt at a closer look of the porous surface. Thanks for the help. I originally thought that there had been some other (abiotic) reason for the porous surface. I still cannot see the details of the holes so I will ask you what they look like. It looks like the holes are on the matrix and the fossil shells. Are the holes angular with some planar interior surfaces? If planar and angular then molds of crystals are likely. Are the spherical? If spherical they might be trace fossils from an encrusting epizoon. What is is the whole thing made of, carbonate, quartz, etc? My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
minnbuckeye Posted September 3, 2019 Share Posted September 3, 2019 Worn coral?? Link to comment Share on other sites More sharing options...
urban fossil Posted September 3, 2019 Author Share Posted September 3, 2019 4 hours ago, DPS Ammonite said: I still cannot see the details of the holes so I will ask you what they look like. It looks like the holes are on the matrix and the fossil shells. Are the holes angular with some planar interior surfaces? If planar and angular then molds of crystals are likely. Are the spherical? If spherical they might be trace fossils from an encrusting epizoon. What is is the whole thing made of, carbonate, quartz, etc? I'd say they are spherical and the rock is carbonate. Link to comment Share on other sites More sharing options...
grandpa Posted September 3, 2019 Share Posted September 3, 2019 The close-up does show something that looks suspiciously like the cell structure of a coral, but the 'cell' size isn't uniform and that's leaving me scratching my head. Link to comment Share on other sites More sharing options...
Ludwigia Posted September 3, 2019 Share Posted September 3, 2019 I'll go with DPS. Like he says, we need sharper photos of the holes. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
urban fossil Posted September 4, 2019 Author Share Posted September 4, 2019 Here are some other photos from a digital microscope. Link to comment Share on other sites More sharing options...
urban fossil Posted September 4, 2019 Author Share Posted September 4, 2019 Link to comment Share on other sites More sharing options...
urban fossil Posted September 4, 2019 Author Share Posted September 4, 2019 Link to comment Share on other sites More sharing options...
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