rcselke Posted August 8, 2020 Share Posted August 8, 2020 I believe the specimen shown in the attached photos fell from a dump truck removing spoil from home excavations up the street from my residence in Gainesville, Prince William County, Virginia. This area lies within the Triassic-Jurassic Culpeper Basin. The specimen weighs 1.5 kilograms has a circumference of 33cm along its major axis, and 29cm along its minor axis. Based on images that are available on the INTERNET, I surmise that this is a fossil sponge. That said, I have absolutely no background or experience in Geology or Paleontology and would appreciate any information or insights members of this forum might be able to provide. Link to comment Share on other sites More sharing options...
Darbi Posted August 8, 2020 Share Posted August 8, 2020 It appears to me as a concretion. 1 Link to comment Share on other sites More sharing options...
rcselke Posted August 8, 2020 Author Share Posted August 8, 2020 Thank you. I waded through quite a number of concretion images but this didn't seem to fit the bill. Live and learn... Link to comment Share on other sites More sharing options...
Darbi Posted August 10, 2020 Share Posted August 10, 2020 You're welcome. There are wide varieties of concretions! Link to comment Share on other sites More sharing options...
rcselke Posted August 10, 2020 Author Share Posted August 10, 2020 Indeed, and a good reason for an old novice like myself to consult with those better versed in the subject. Thanks, again. Link to comment Share on other sites More sharing options...
Coco Posted August 19, 2020 Share Posted August 19, 2020 In the future, will you be able to write in letters of normal size? When you write in large letters or in capitals, it means that you are shouting. thanks. Coco ---------------------- OUTIL POUR MESURER VOS FOSSILES : ici Ma bibliothèque PDF 1 (Poissons et sélaciens récents & fossiles) : ici Ma bibliothèque PDF 2 (Animaux vivants - sans poissons ni sélaciens) : ici Mâchoires sélaciennes récentes : ici Hétérodontiques et sélaciens : ici Oeufs sélaciens récents : ici Otolithes de poissons récents ! ici Un Greg... Link to comment Share on other sites More sharing options...
jpc Posted August 19, 2020 Share Posted August 19, 2020 2 hours ago, Coco said: In the future, will you be able to write in letters of normal size? When you write in large letters or in capitals, it means that you are shouting. thanks. Coco I agree Link to comment Share on other sites More sharing options...
rcselke Posted August 20, 2020 Author Share Posted August 20, 2020 Sorry, I'm getting old and don't see very well. Link to comment Share on other sites More sharing options...
minnbuckeye Posted August 20, 2020 Share Posted August 20, 2020 I agree that concretion is likely. With that said, I did enlarge your picture and saw what could be a sponge like surface. Could you take a close up of a section of the specimen? Mike Link to comment Share on other sites More sharing options...
rcselke Posted August 20, 2020 Author Share Posted August 20, 2020 Here are two close ups of areas I thought were interesting, but I'm not sure I know what you are looking for. To me these photos show what I would consider pores and some other things that look like calcium structure of some kind. Ray Selke Link to comment Share on other sites More sharing options...
rcselke Posted August 21, 2020 Author Share Posted August 21, 2020 Link to comment Share on other sites More sharing options...
minnbuckeye Posted August 21, 2020 Share Posted August 21, 2020 That shows much better what I was seeing on your initial pictures. I will defer to the experts now as to whether this is a sponge or not!! Though I am leaning towards "not". Mike Link to comment Share on other sites More sharing options...
rcselke Posted August 21, 2020 Author Share Posted August 21, 2020 Thank you Mike. I'm good either way. Just didn't want something that might have some scientific value go (literally) down the drain. Link to comment Share on other sites More sharing options...
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