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Found 30 results

  1. Priscacara or Cockerellites

    What is the proper name for Priscacara/Cockerellites fish, Priscacara or Cockerellites?
  2. Priscacara fry from Green River

    My wife and I took a wonderful trip to the American Quarry near Kemmerer, Wyoming this September. One of the most unusual finds we made was this teeny tiny Priscacara baby. I do love finding the big fish, but this tiny little guy has a lot of attitude. He was by far the smallest fish we found on the trip. edit - for those of you not familiar with US coins - fish is approx. 15 mm nose to tail.
  3. Wyoming Fossil Lake Trip

    Well what a quick dig. We started our trip to Yellowstone and Mt. Rushmore with a couple of stops and our Search for fossils as we searched for two dig sites on our way. Our first stop was U-dig Fossils in Utah. Here we were suppose to hunt for trilobites but after to talking to a couple of people leaving the site they were very disappointed and found only a couple in their 2 hours. So because I had another site to check out we passed on digging there. Plus at 80.00 per person per day it didn’t not fit our plans. So our next stop ended up at the Fossil Safari in Wyoming where we were much happier and we all thought is was well worth it. It took us an extra hour to find the place because google maps put us on a goat trail that we had to turnaround on because we had an luggage rack attachment that had a low clearance. If it was not for a Park Ranger that was on the trail we would of found ourselves in trouble. But she was great redirecting us around the track we were on. So when we got to dig site we were surprised to see that their was only one other digger at the site. For me I just wanted to explore around the area and then start digging and the others just wanted to watch. But after I started digging and finding some fish fossils everyone wanted to dig. After talking to the manager of the site he explained that they found a prehistoric Horse on the ridge and he had two others digging. He allowed me to go and check it out but no photos as the site is privately funded and because I was a fellow hunter that I would enjoy it. Here are a couple pictures of us digging. Or should I say me!!!
  4. Priscacara indet. (Juvenile)

    From the album Green River Formation

    This is a very small 2.5 inch long Priscacara indet. These fish can easily be mistaken for a Knightia or an Amphiplaga because of the similarity in shape.
  5. Priscacara done!

    I just have to brag about @Ptychodus04 a bit more. This man is a master at preparing fossil fish. Someday I hope to be a fraction as good as he is. Here's what he ended up with on the Priscacara I sent him. This was not an easy prep. The right side was completely covered with matrix and the left side exposed. He glued the pieces back together and started prepping on the right side top down. Excellent job Kris. Here's what he sent me.
  6. Fish IG.jpg

    From the album Priscacara

    Vaniman <a href="http://www.yahoo.com">Vaniman</a>
  7. From the album Priscacara

    This specimen is from the Green River formation in Wyoming. Found split in two, unfortunately. These images show a before and after prep job using a Vaniman mobile Problast sandblaster. The specimen is a Priscacara from the Eocene period.
  8. From the album Priscacara

    This specimen is from the Green River formation in Wyoming. Found split in two, unfortunately. These images show a before and after prep job using a Vaniman mobile Problast sandblaster. The specimen is a Priscacara from the Eocene period.
  9. From the album Priscacara

    This specimen is from the Green River formation in Wyoming. Found split in two, unfortunately. These images show a before and after prep job using a Vaniman mobile Problast sandblaster. The specimen is a Priscacara from the Eocene period.
  10. From the album Priscacara

    This specimen is from the Green River formation in Wyoming. Found split in two, unfortunately. These images show a before and after prep job using a Vaniman mobile Problast sandblaster. The specimen is a Priscacara from the Eocene period.
  11. From the album Priscacara

    This specimen is from the Green River formation in Wyoming. Found split in two, unfortunately. These images show a before and after prep job using a Vaniman mobile Problast sandblaster. The specimen is a Priscacara from the Eocene period.
  12. From the album Priscacara

    This specimen is from the Green River formation in Wyoming. Found split in two, unfortunately. These images show a before and after prep job using a Vaniman mobile Problast sandblaster. The specimen is a Priscacara from the Eocene period.
  13. From the album Priscacara

    This specimen is from the Green River formation in Wyoming. Found split in two, unfortunately. These images show a before and after prep job using a Vaniman mobile Problast sandblaster. The specimen is a Priscacara from the Eocene period.
  14. From the album Priscacara

    This specimen is from the Green River formation in Wyoming. Found split in two, unfortunately. These images show a before and after prep job using a Vaniman mobile Problast sandblaster. The specimen is a Priscacara from the Eocene period.
  15. From the album Priscacara

    This specimen is from the Green River formation in Wyoming. Found split in two, unfortunately. These images show a before and after prep job using a Vaniman mobile Problast sandblaster. The specimen is a Priscacara from the Eocene period.
  16. From the album Priscacara

    This specimen is from the Green River formation in Wyoming. Found split in two, unfortunately. These images show a before and after prep job using a Vaniman mobile Problast sandblaster. The specimen is a Priscacara from the Eocene period.
  17. From the album Priscacara

    This specimen is from the Green River formation in Wyoming. Found split in two, unfortunately. These images show a before and after prep job using a Vaniman mobile Problast sandblaster. The specimen is a Priscacara from the Eocene period.
  18. From the album Priscacara

    This specimen is from the Green River formation in Wyoming. Found split in two, unfortunately. These images show a before and after prep job using a Vaniman mobile Problast sandblaster. The specimen is a Priscacara from the Eocene period.
  19. From the album Priscacara

    This specimen is from the Green River formation in Wyoming. Found split in two, unfortunately. These images show a before and after prep job using a Vaniman mobile Problast sandblaster. The specimen is a Priscacara from the Eocene period.
  20. From the album Priscacara

    This specimen is from the Green River formation in Wyoming. Found split in two, unfortunately. These images show a before and after prep job using a Vaniman mobile Problast sandblaster. The specimen is a Priscacara from the Eocene period.
  21. From the album Priscacara

    This specimen is from the Green River formation in Wyoming. Found split in two, unfortunately. These images show a before and after prep job using a Vaniman mobile Problast sandblaster. The specimen is a Priscacara from the Eocene period.
  22. Priscacara Preparation

    @Ptychodus04 is preparing a fossil fish in exchange for some on the side web development (web page). Here's where he is at with the preparation and I must say that I'm very pleased with the results. This is going to turn out to be one amazing fish. Here's a before and after. The before was a fish that was broken in half and in need of some restoration and repair but is mostly there. Kris is really working his magic on this one.
  23. I have difficulties to find out what this small fish (1.8" or 4,5cm) from the Eocene GRF is. A baby Priscacara or Cockerellites? Or is it a Hypsiprisca hypsacantha? Or one of these so far (?) undescribed Priscacara species? The tail fin seems to be very, very slightly forked (almost round) and the Praeoperculum bears some spines. So I would guess Hypsiprisca hypsacantha, but I am not sure. Who can help? Thanks Thomas
  24. Priscacara Prep from 18" Layer

    As I mentioned in a previous post, when I was at the Tucson Fossil Show I picked up some unprepared slabs of Green River Fish from the 18” layer. That prompted some of you to say you expected me to post photos as I did the prep work. I initially rejected that idea because I’m pretty bad at prepping and I didn’t want to post pictures showing how bad I am. But then I remembered some advice I once got from a manager I reported to early in my career. After I made an engineering decision that didn’t turn out so well, he told me, “It looks like your fate in life is to serve as the bad example everyone else learns from.” That cheery sentiment was underscored by this framed inspirational poster he had hanging on his office wall: So with that in mind, I decided to go ahead and post photos of my prep work, not to show you how to do it, but rather to give you the bad example everyone else can learn from. I picked up a total of four slabs, but the one I will show you in this and subsequent posts is one that was claimed to be a Priscacara species. Of course you don’t know for sure until you do the prep, but I wouldn’t be surprised if they had done some sort of X-ray before they put the slabs out for sale to make sure they weren’t selling a rare specimen for a dirt-cheap price. In any event I’ve been happy with the specimen, even if the quality of the prep could be better (this is my first time prepping a specimen from the 18" layer). I actually started the initial prep while still in my hotel room in Tucson, but I don't have a photo of this fish from there. Here's a photo of one of the other slabs to give you an idea of what they looked like. The seller drew a bunch of lines in pencil to show what he thought was the outline of the fish, so that's mostly what you are seeing here. It was a lot easier to prep once I got it home. I only have manual scribes so it is a very slow process. Here’s a photo of my setup. I’m convinced I would not be able to do this without the microscope, which I keep at the lowest setting, 6X. I have 3 probe tips, all purchased from Paleotools when I was at the show. I also bought two pin vises to go along with the one I already had. Of the probe tips, one is oval, one is flat like a flat-head screwdriver, and one is a sharp point. With my technique I have found the oval probe to be the most useful, followed by the flat tip. I only use the pointy one to do delicate cleanup in tight spots. To keep the dust from getting all over the place I mostly use the yellow brush to clean it off and save the blower for critical spots. Even then I don't use it at anywhere near full blast power. Even so, you can see it's already covered in dust. Here’s how it looks after about 5 hours of prep (I said it was a very slow process!). The tail looks like it has been blown up, probably due to decomposition before being covered with silt. The ribs are looking pretty good except for at least one that’s far out of position and pointing in a completely different direction than the rest. Looks like it has 9 dorsal spine rays, which is consistent with Priscacara serrata. The areas around the pelvic fin and where the caudal rays branch from the body were prepped by the seller, probably with air abrasion, I assume to help sell the specimen. Here it is after about another 3 hours, mostly to expose the anal rays and further clean up the dorsal spines. It has 3 anal spine rays, further confirming it identification. You can see my favorite probe tip on the left. Next up is to start working on the head, which will be more difficult because the matrix covering it is a lot thicker. This fish is definitely from the 18” layer, as the smell of petroleum is pretty strong. I’m finding I can only work for about half an hour at a time, two or three times a day. If I work longer, I get nauseous and get a headache that doesn’t go away for a day. So this is making the prep go even slower. I did a search on the TFF forum for other threads on prepping Priscacara from the 18” layer and found a good one from back in 2017, in which @Ptychodus04 recommended dampening the matrix to soften it. I have been doing this and it not only softens the matrix it also keeps down the dust and fumes. And it adds contrast when I take photos. Good idea! Here’s where I am at now, after about another 5 hours of work. The head is starting to emerge, but I have to say I can’t identify any of its features when I compare them to the photos from Lance Grande’s book, The Lost World of Fossil Lake. Not sure what is going on here, I’m open to suggestions. Meanwhile I will keep plugging away and post occasional updates as I have them. What are these bones?
  25. New species or genetic mutation?

    I have been blessed this summer to have some amazing finds up in Green River. A couple of them come in the form of strange pathologies on a common fish. The Priscacara (or Cockerellites as it is now known) Is quite a common fish to find in multiple layers of the Green River Formation. The Cockerellites is closely related to modern perch, and is a highly prized fish due to it's unique appearance! I know there was a paper recently written (I believe in 2010) by John Whitlock, but I cannot seem to find it on any open access sites. Part of his debate for a new genus is fueled by the fact that serrata and liops have differing numbers of dorsal and anal spines. I present to you today 2 of my more uncommon finds from Green River showing variations of these animals. 99%+ of the Cockerellites found have just 10 dorsal spines, I present today my 2 unique finds from this past dig season! Fish number 1 was discovered on July 29, 2017 Fish number 2 was discovered on September 23, 2017 The first picture shows a Cockerellites liops with 11 dorsal spines. this second photos shows an even more perplexing mutation. This Cockerellites liops has 12 dorsal spines!! While multiple fish have been found with 11 dorsal spines, I am unsure if anyone has ever found a fish with 12 dorsal spines. This is a very unique occurrence and should this fish be a new variant it will be donated to Fossil Butte National Monument! Even though he is missing most of his anal fins, this fish could still be a very important specimen to show mutations. So, do you think these 2 fish could represent new species within the Genus? Or are they simply mutations?
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