MarcoSr Posted May 12, 2013 Share Posted May 12, 2013 Some of my fossil hunting trips take place at home breaking down and looking through matrix obtained from collectors worldwide. This matrix came from the Cretaceous (Campanian) of Hallencourt France. Most of the nicer specimens that I found in this matrix were in the 1.5mm to 4 or 5mm size range. Almost all of the larger teeth were damaged (missing roots, broken root lobes, crown damage). The matrix is a very hard chalk which requires a pick ax or jack hammer to get the matrix from the formation which adds to the tooth damage. I am posting below pictures of a small number of the nicer and more unusual specimens which I found. Chiloscyllium greeni were very numerous in this matrix. There were a very limited number of ray teeth species found. However, I did find multiple shark species that were new to my collection. I also posted a few other specimens which I do not know what they are. Most specimens were very light colored which required a black background for the pictures which I really don’t like to use. Each new matrix that I search makes me more of an avid micro tooth collector. If anyone has or can collect good matrix with shark, ray, and fish micros please send me a PM. Carcharias latus Chiloscyllium greeni crab claw tip Cretalamna appendiculata Anomotodon hermani Cederstroemia havreensis Crassescyliorhinus germanicus Galeorhinus girardoti Palaeogaleus havreensis Paraorthacodus conicus Pseudocorax laevis fish teeth shark cartilage shells Squalicorax sp. Squatirhina kannensis unknown (See below replies) Marco Sr. 2 "Any day that you can fossil hunt is a great day." My family fossil website Some Of My Shark, Ray, Fish And Other Micros My Extant Shark Jaw Collection Link to comment Share on other sites More sharing options...
Foshunter Posted May 12, 2013 Share Posted May 12, 2013 Very nice specimens, how did you remove such fragile teeth from the hard matrix, if it's not a family secret?----Tom Grow Old Kicking And Screaming !!"Don't Tread On Me" Link to comment Share on other sites More sharing options...
Auspex Posted May 12, 2013 Share Posted May 12, 2013 Very impressive; stunning, even "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease! Link to comment Share on other sites More sharing options...
fossilselachian Posted May 12, 2013 Share Posted May 12, 2013 Great shark tooth photos. I like the black background. Link to comment Share on other sites More sharing options...
Al Dente Posted May 12, 2013 Share Posted May 12, 2013 Marco- nice fossils and nice pictures. These fossils are the centrodorsal ossicles from comatulid crinoids (also known as centrodorsal plates). 1 Link to comment Share on other sites More sharing options...
Bullsnake Posted May 12, 2013 Share Posted May 12, 2013 centrodorsal.jpg Marco- nice fossils and nice pictures. These fossils are the centrodorsal ossicles from comatulid crinoids (also known as centrodorsal plates). Yes, really nice material! I was thinking these look like crinoid plates, as well. And these look like forams. Sorry, I can't get any more scientific than that, so I could well be wrong! Steve Link to comment Share on other sites More sharing options...
MarcoSr Posted May 12, 2013 Author Share Posted May 12, 2013 Very nice specimens, how did you remove such fragile teeth from the hard matrix, if it's not a family secret?----Tom Most of the teeth are broken. For every nice specimen, 10 or more are broken. Taking pieces as large as possible and then breaking the chalk down with acetic acid (10% vinegar) helps a little with the real small teeth. Marco Sr. "Any day that you can fossil hunt is a great day." My family fossil website Some Of My Shark, Ray, Fish And Other Micros My Extant Shark Jaw Collection Link to comment Share on other sites More sharing options...
MarcoSr Posted May 12, 2013 Author Share Posted May 12, 2013 Great shark tooth photos. I like the black background. It is more difficult and takes longer for me to take pictures with a black background. Black backgrounds show dust, lint, etc. and I have to use very low exposures to remove them. Although, I do agree and like how the pictures look. Marco Sr. "Any day that you can fossil hunt is a great day." My family fossil website Some Of My Shark, Ray, Fish And Other Micros My Extant Shark Jaw Collection Link to comment Share on other sites More sharing options...
MarcoSr Posted May 12, 2013 Author Share Posted May 12, 2013 centrodorsal.jpg Marco- nice fossils and nice pictures. These fossils are the centrodorsal ossicles from comatulid crinoids (also known as centrodorsal plates). Yes, really nice material! I was thinking these look like crinoid plates, as well. And these look like forams. Sorry, I can't get any more scientific than that, so I could well be wrong! Thank you for the id help. This is the first time I have found parts of crinoids in matrix that I have looked through. I also don't see forams much. Probably because I need to use acetic acid to break down a lot of the matrixes that I look through which destroys specimens like forams, but doesn't hurt the shark, ray and fish teeth that I am looking for if I keep the acetic acid at or below 10%. Marco Sr. "Any day that you can fossil hunt is a great day." My family fossil website Some Of My Shark, Ray, Fish And Other Micros My Extant Shark Jaw Collection Link to comment Share on other sites More sharing options...
MarcoSr Posted May 12, 2013 Author Share Posted May 12, 2013 Very impressive; stunning, even Thank you. I am trying to get more folks interested in the shark, ray and fish micros. Marco Sr, "Any day that you can fossil hunt is a great day." My family fossil website Some Of My Shark, Ray, Fish And Other Micros My Extant Shark Jaw Collection Link to comment Share on other sites More sharing options...
siteseer Posted May 12, 2013 Share Posted May 12, 2013 (edited) MarcoSr, The first three marked as Squatirhina look like Rhinobatos. Squatirhina has a high, pointed cusp though it it is often found worn down. That's great stuff. I have seen an article on that and a friend gave me a few teeth. He had a lot of Chiloscyllium too. Jess Some of my fossil hunting trips take place at home breaking down and looking through matrix obtained from collectors worldwide. This matrix came from the Cretaceous (Campanian) of Hallencourt France. Most of the nicer specimens that I found in this matrix were in the 1.5mm to 4 or 5mm size range. Almost all of the larger teeth were damaged (missing roots, broken root lobes, crown damage). The matrix is a very hard chalk which requires a pick ax or jack hammer to get the matrix from the formation which adds to the tooth damage. I am posting below pictures of a small number of the nicer and more unusual specimens which I found. If you place your cursor on a JPEG image you will see the file name which will have the specimen id as best that I can determine. Chiloscyllium greeni were very numerous in this matrix. There were a very limited number of ray teeth species found. However, I did find multiple shark species that were new to my collection. I also posted a few other specimens which I do not know what they are. Most specimens were very light colored which required a black background for the pictures which I really don’t like to use. Each new matrix that I search makes me more of an avid micro tooth collector. If anyone has or can collect good matrix with shark, ray, and fish micros please send me a PM. Marco Sr. Edited May 12, 2013 by siteseer Link to comment Share on other sites More sharing options...
MarcoSr Posted May 13, 2013 Author Share Posted May 13, 2013 MarcoSr, The first three marked as Squatirhina look like Rhinobatos. Squatirhina has a high, pointed cusp though it it is often found worn down. That's great stuff. I have seen an article on that and a friend gave me a few teeth. He had a lot of Chiloscyllium too. Jess Jess I had the same thoughts when I made the id of them. Both Rhinobatos and Squatirhina are found in the fauna. I have a good number of Squatirhina from the Maastrichtian of the Netherlands and looked at them. The males have a very high pointed cusp but some of the females are relatively low. Plus they have a frilling around the crown and an apron. All four specimens posted have a frilling around the crown which may not be evident in the pictures and the first and fourth have prominent aprons. Although frilling is very faint on the second and third specimens and could instead be damage versus frilling and there isn't really an apron on them either. But with Rhinobatos I expect both a medial and lateral uvulae and these don't really have lateral uvulae. However I do still have doubts especially about the second and third specimens which could be Rhinobatos, Marco Sr. "Any day that you can fossil hunt is a great day." My family fossil website Some Of My Shark, Ray, Fish And Other Micros My Extant Shark Jaw Collection Link to comment Share on other sites More sharing options...
missingdigits Posted May 20, 2013 Share Posted May 20, 2013 Thank you. I am trying to get more folks interested in the shark, ray and fish micros. Marco Sr, Sold! Link to comment Share on other sites More sharing options...
cowsharks Posted May 20, 2013 Share Posted May 20, 2013 Marco, have you found anything that has been positively ID'd as being something new? I bet the chances for that are good considering the amount of time and effort that goes into studying these little boogers. Daryl. Link to comment Share on other sites More sharing options...
MarcoSr Posted May 21, 2013 Author Share Posted May 21, 2013 Marco, have you found anything that has been positively ID'd as being something new? I bet the chances for that are good considering the amount of time and effort that goes into studying these little boogers. Daryl. Daryl Yes, I found a new species micro mammal jaw, Peradectes Gulottai, which I donated to the Smithsonian a few years back that Ken Rose wrote a paper on. I also have found a good number of ray and shark specimens that have been identified by Robert Purdy and Gerard R. Case as new species. I have shown specimens to Robert at the Aurora Fossil Festival for years which he has said looked "new to him" or "he hadn't seen anything like that before". However he did always end the conversation with "However, there could be a sheet on it that I am not aware of." I had sent pictures of these and other different shark and ray specimens to Jerry Case and he visited my house for a week last September to look at a portion of my collection. He looked at specimens from a site in NJ, two in MD and one in VA. He said I had a new shark species from NJ, multiple new shark and ray species from MD including a new ratfish species and multiple new species from Virginia. Jerry only looked at specimens from the four sites. I have micros from matrix from close to 100 sites throughout the US, Europe, North Africa and Australia. One of these days I need to donate everything so papers can be written on them. Marco Sr. "Any day that you can fossil hunt is a great day." My family fossil website Some Of My Shark, Ray, Fish And Other Micros My Extant Shark Jaw Collection Link to comment Share on other sites More sharing options...
ynot Posted September 26, 2017 Share Posted September 26, 2017 Do not know how I missed this one! Very nice. Tony 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...
MarcoSr Posted September 27, 2017 Author Share Posted September 27, 2017 22 hours ago, ynot said: Do not know how I missed this one! Very nice. Tony Tony Thank you. It is an old post. I just posted the link to help TFF member who was trying to break down the matrix from Hallencourt to see what might be in it. Marco Sr. 1 "Any day that you can fossil hunt is a great day." My family fossil website Some Of My Shark, Ray, Fish And Other Micros My Extant Shark Jaw Collection Link to comment Share on other sites More sharing options...
Notidanodon Posted June 12, 2021 Share Posted June 12, 2021 (edited) Thought I would bring this topic back up, it’s a gud’un @MarcoSr would you mind posting the ID's in a list, i dont think you can view file names any more thanks Edited June 12, 2021 by will stevenson Link to comment Share on other sites More sharing options...
Coco Posted June 13, 2021 Share Posted June 13, 2021 Hi, I agree with Will, your pictures don’t have their names when you put the mouse over them, and that’s too bad about this great job 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...
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