Lone Hunter Posted September 27, 2022 Share Posted September 27, 2022 Found in Woodbine if that matters, it looks structured but I think it's the makeup of the rock. Last pic is backside. Link to comment Share on other sites More sharing options...
debivort Posted September 27, 2022 Share Posted September 27, 2022 slickenside vibes for me. 1 1 Link to comment Share on other sites More sharing options...
DPS Ammonite Posted September 27, 2022 Share Posted September 27, 2022 Take out the L; it looks like slickensides to me. 1 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...
Lone Hunter Posted September 27, 2022 Author Share Posted September 27, 2022 I've seen different spellings inc. slickenlines, is that different? Link to comment Share on other sites More sharing options...
DPS Ammonite Posted September 27, 2022 Share Posted September 27, 2022 (edited) There is a lot of overlap of definitions between slickensides and slickenlines. Slickensides refer to the polished planes in a fault zone. Slickenlines refer to the linear striations. You piece shows both. https://en.m.wikipedia.org/wiki/Slickenside https://en.m.wikipedia.org/wiki/Fault_trace “Not only are large scale linear features indicative of fault traces but small lineations found on rock samples or rock faces also are. Slickenlines are one type of lineation which are linear gouges scraped into a rock from different rocks grinding along against each other. Slickenlines indicate a fault as well as its motion, which can be very useful in many studies.” See: Fleuty, M. (1975). Slickensides and slickenlines. Geological Magazine,112(3), 319-322. doi:10.1017/S0016756800047087 https://www.cambridge.org/core/journals/geological-magazine/article/slickensides-and-slickenlines/93015FB3763E27C4D5D3F0F2A69EB44F Edited September 27, 2022 by DPS Ammonite 5 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...
Rockwood Posted September 27, 2022 Share Posted September 27, 2022 In an area that gypsum is common you might want to consider the possibility of vertisols. They can have a similar appearance, and needn't be associated with faults. Link to comment Share on other sites More sharing options...
DPS Ammonite Posted September 27, 2022 Share Posted September 27, 2022 3 minutes ago, Rockwood said: In an area that gypsum is common you might want to consider the possibility of vertisols. They can have a similar appearance, and needn't be associated with faults. Looks like a solid rock and not plastic soil with slickensides. Vertisol refers to soils. 2 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...
TqB Posted September 28, 2022 Share Posted September 28, 2022 You can get calcite like this along stylolite layers. https://commons.wikimedia.org/wiki/File:Stylolite_in_limestone_(Brassfield_Formation,_Lower_Silurian;_Fairborn,_Ohio,_USA)_2_(26735361019).jpg 2 1 Tarquin Link to comment Share on other sites More sharing options...
Mark Kmiecik Posted September 28, 2022 Share Posted September 28, 2022 Isn't slickensides a surface feature? I think I see more of the structure internally in photo number 3. Mark. Fossil hunting is easy -- they don't run away when you shoot at them! Link to comment Share on other sites More sharing options...
Rockwood Posted September 28, 2022 Share Posted September 28, 2022 26 minutes ago, Mark Kmiecik said: Isn't slickensides a surface feature? Are faults surface features ? Same answer. Link to comment Share on other sites More sharing options...
DPS Ammonite Posted September 28, 2022 Share Posted September 28, 2022 23 minutes ago, Mark Kmiecik said: Isn't slickensides a surface feature? I think I see more of the structure internally in photo number 3. You can have many different slickensides in a zone. Faults are not always expressed as a single fault plane (slickenside); they are zones of many semi parallel planes, zones of clay and crushed rocks. 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...
Rockwood Posted September 28, 2022 Share Posted September 28, 2022 Wouldn't it be unusual for a single fault plane not to have some gap which fills with minerals ? Link to comment Share on other sites More sharing options...
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