goodjoe Posted July 3, 2017 Share Posted July 3, 2017 Can anyone help with if this is just a rock. No luck finding any information. Found in north Texas at excavation site. Thanks. Link to comment Share on other sites More sharing options...
ynot Posted July 3, 2017 Share Posted July 3, 2017 Welcome to TFF! Looks like a chert nodule. Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
Darktooth Posted July 3, 2017 Share Posted July 3, 2017 I agree. Welcome to the forum from New York! I like Trilo-butts and I cannot lie. Link to comment Share on other sites More sharing options...
abyssunder Posted July 3, 2017 Share Posted July 3, 2017 It could be also a septarian nodule. I can see the septarian propagation cracks and the internal mineralization. " Limestone "septarian nodules" ranging in size from a few centimeters to a meter or more in diameter are located in Eagle Ford shale formation beds intermittently exposed in a band along and west of Loop 12 between IH-30 to the north (in the vicinity of the old Chalk Hill Quarry) and IH-20 to the south in southwest Dallas, Texas. The larger nodules are occasionally hollow and contain calcite crystals, pyrite (including filiform or "wire" pyrite, and rarely, small isolated sphalerite crystals). " - link to source 1 " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
westcoast Posted July 4, 2017 Share Posted July 4, 2017 A few drops of vinegar on a clean internal surface of the rock will tell you if it's a chert or limestone septarian nodule Link to comment Share on other sites More sharing options...
BobWill Posted July 4, 2017 Share Posted July 4, 2017 Welcome to the forum. I agree with septarian concretion based on the location. You can also see a possible calcite inclusion which would also be fairly common. The vinegar will fizz when it contacts the limestone if this is correct. If you find yourself in the area of Farmers Branch on Wednesday evening the 12th you can bring it to the July meeting of the Dallas Paleontological Society for an examination by experts. Lots of local geologists will be on hand as well as the usual amateur (and a few professional) paleontologists. This month we are having a show-and-tell/fossil swap/ice cream social instead of a speaker at a different location from usual (with an open bar). Details at dallaspaleo.org Link to comment Share on other sites More sharing options...
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