Innocentx 879 Report post Posted November 10, 2018 Found this on a gravel bar just below boundary to Permian but not sure about source. I had some trouble getting focused photo of edges. I'm thinking possibly algae. Share this post Link to post Share on other sites
Tidgy's Dad 9,906 Report post Posted November 10, 2018 Drusy quartz, I think, or could be drusy calcite. See if it fizzes with weak acid. Share this post Link to post Share on other sites
hndmarshall 55 Report post Posted November 10, 2018 is there such thing as a carpet sponge?....but seriously to me it looks corral like and it is on a layered foundation of fossil material....but then I am a newbie and its a guess based on my observation...eagerly waiting for the experts opinions.... Share this post Link to post Share on other sites
abyssunder 5,357 Report post Posted November 10, 2018 bioeroded shell material? Share this post Link to post Share on other sites
ynot 7,087 Report post Posted November 10, 2018 I think it is a mineral deposit, wonder if this could be a bryozoan? Can You post a close up picture of the surface (show in first picture). Share this post Link to post Share on other sites
Innocentx 879 Report post Posted November 10, 2018 @Tidgy's Dad Yes, it fizzes. @ynot Here's best close up I can get. Share this post Link to post Share on other sites
ynot 7,087 Report post Posted November 10, 2018 In my opinion it is a non fossil deposit of calcite. Share this post Link to post Share on other sites
abyssunder 5,357 Report post Posted November 10, 2018 11 minutes ago, Innocentx said: Yes, it fizzes. That means is not quartz, but calcite. Share this post Link to post Share on other sites
Innocentx 879 Report post Posted November 10, 2018 I expect you're right. I've just never seen this configuration before. Thanks for looking! @ynot @Tidgy's Dad @abyssunder and for your help. @hndmarshall I thought sponge was a possibility as well. Good to know better! Patty Share this post Link to post Share on other sites
Tidgy's Dad 9,906 Report post Posted November 10, 2018 Calcite druse. Share this post Link to post Share on other sites
