DPS Ammonite Posted March 24, 2020 Share Posted March 24, 2020 I found the silicified and brecciated laminar structures in Miocene lake deposits north of Phoenix, Arizona. Could they be disturbed algal mats? I envision a drying algal mat in a lake that is disturbed by an event such as a flood, windstorm, landslide or earthquake. Compare to Kinneyia trace fossil: https://woostergeologists.scotblogs.wooster.edu/2015/10/23/woosters-fossil-maybe-of-the-week-kinneyia-ripples/ Confirmed stromatolites occur nearby in the lake sediments. Photo 1: typical wrinkled/ cracked marks in surface of laminar structures. Photo 2: typical piece of folded and brecciated laminar structures. Photo 3: detail of photo 2. Photo 4: edge of rock in photo 2. 4.5 cm field of view. Photo 5: Another piece. Photo 6: detail of photo 5. Photo 7: edge of photo 5. 3 cm field of view. 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...
abyssunder Posted March 25, 2020 Share Posted March 25, 2020 Very interesting samples! The first one reminds me of boxwork, the second one of bivalves in section, naybe oysters, but is just a guess. " 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...
supertramp Posted March 25, 2020 Share Posted March 25, 2020 Really intriguing; it looks like (pic 2 and ss) an intraclastic breccia, with the intraclasts corresponding to a fractured and folded… how to say? – in italian I would call that “tappeto algale” (word for word: “algal carpet”). ciao Link to comment Share on other sites More sharing options...
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