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Found 11 results

  1. Arcadia Park/Britton Gastropod/Ammonite?

    On Sunday afternoon I went out with Keith Minor to a North Texas site exposing the lower Arcadia Park formation and (possibly?) the top of the Britton Formation (lower Turonian, upper Cenomanian respectively). The hunt almost never happened after various storm cells were menacing us and the high winds were thrusting cranes into sky scrapers and whipping up emphysema inducing dust clouds. Yet, even though everyone around us was getting Kansas blown at them, we were only exposed to the high winds and rain so cold and blown so hard that it felt almost like hail. But that lasted for only a few minutes, leaving the rest of the day to muck around in the Turonian while the winds blew most of the clouds away by hunt’s end. The Kamp Ranch Limestone is exposed very nicely at the site, as well as meters of shale beds above and below it, making a short study of the successive stratification obligatory. FIG 1: The roughly 38 cm (15 inch) thick Kamp Ranch jutting out amongst the soft shale and clay above and below it. The clouds foretell the showers to befall us. (ID request incoming)
  2. Now that the weather has finally warmed up a little in these parts and the ice has gone off the lake, my friend and I were able to return to Lake Diefenbaker for some back country fossil hunting. In addition to scouting some new potential sites, we were particularly interested in visiting the site documented in this post here, which has already proven to be a diverse and abundant fossil bed. Hunting the beaches at this time of year is particularly lucrative, as the flood waters from the mountains have not yet reached the lake, and water levels can be as low as five meters below the high water mark. Reaching these sites can be a challenge however, and a good Zodiac raft seems to be a must. A view from base camp... Our typical MO is to launch with all of our gear, set up a camp in a sheltered spot like this, then take day trips with the raft out to productive areas. 1 Once at the site, we began encountering giant ammonites like this placenticeras meeki: 1 These occur somewhat frequently in the Bearpaw formation in general, but it's rare to find intact and relatively uncrushed ones. Here are some photos of the largest we encountered (sorry for small photo size and weird angle): 1 2 This smaller placenticeras meeki has more or less all of the surface shell material preserved: 1 And of course, a somewhat beefier placenticeras intercalare with some impressive suturing and ornamentation: 1 Now, here are some photos of some vertebrate remains also found within the nodules. These (and naturally any of the other fossils we've found that they determine as important) will be delivered to the Royal Saskatchewan Museum next time we arrange to go to the site with them. I believe that these are all fish remains aside from the vertebra, perhaps someone could shed some light here: 1 2 3 4 Bonus bullsnake photo: 1 PS - I'm getting this error message when I try embedding photos into the post, "The link could not be embedded because of an unexpected error: Forbidden: 'Something went wrong. Please try again.' " Anyone know what's up with that?
  3. Placenticeras pseudoplacenta (Hyatt 1903)

    From the album Cephalopods Worldwide

    3cm. A gift from PFooley Carlile Shale Member Mancos Shale Formation Turonian Late Cretaceous From Sandoval County, New Mexico, USA
  4. I have heard that it's not uncommon to find examples of the ammonite placenticeras meeki with evidence of supposed mosasaur predation marks. A certain example of mine has since stood out as a possible contender. This example comes from deposits of the late Campanian Bearpaw Formation, a unit that is already well known for its good preservation of late Cretaceous molluscs, including placenticeras meeki with the supposed predation marks. I know that there are competing theories about the origin of these marks, including abrasion by limpets or other gastropods, so I'm curious about whether any of you are in agreement that this conspicuous pattern is evidence that this particular placenticeras was chomped by a mosasaur. A note about the specimen - I somewhat foolishly decided that a fine grain sandpaper was the solution for getting rid of the stubborn bits of sandstone matrix and pyrite that clung to the nacre, so most of the surface, including the rims of the matrix filling the puncture holes, is slightly polished. Also unfortunate is the fact that this ammonite, on account of most of the internal chambers being completely hollow, smashed into hundreds of little pieces once the concretion containing it was split. Fitting these fragments back together is essentially impossible, and I'm regretful that the specimen was ruined slightly by not being extracted carefully enough, but thankfully there's still a significant amount of it that's still intact. If anything, it seems to be telling that the only part of the fossil that isn't hollow (and therefore more durable) is where the puncture holes are, given that these holes would have allowed water and sediment to enter the chambers they had breached. The chambers which did not fill with matrix, on the other hand, could not handle the stress of the concretion being split, and shattered. Anyway, the first photo here shows the first two holes. These are on the left side of the ammonite. Note that the nacre around the punctures is cracked, where otherwise it is smooth and unblemished. The right side, showing the third puncture hole. It is difficult to tell in the photo, but this hole is depressed slightly into the ammonite. The bit near the end of the tape measure could also be a hole, but it's difficult to tell with so much pyrite encrusting it. Finally, a front-facing view. I've added arrows to approximate the location of the holes on either side. Note the preservation of the nacre of the septum, and how much of it is still covered by pyrite. Note that the other end of the fossil has no obvious septa, leading me to believe that this fragment is from near the body chamber. So, thoughts? I know that the origin of this type of trace fossil is still somewhat contested in paleontology, and I'm really curious about what the forum's consensus will be.
  5. Bow River Alberta fossil trip May 2018

    It has been two years since I last went on a fossil hunt along the Bow River. Permission from landowners is a must but there is also lots of public land affords river access. Lots of climbing. 250 feet of elevation might not seem like much but it sure takes its toll when you load a large partial ammonite into your pack. Two trip; the second one just to make sure there wasn't a piece in the water that I could see. I actually climbed high to an exposed concretion and, knowing it wasn't a fossil, I broke it and watched it bounce and plunge into the river. Now I know just how far out the rest of this fossil will be. Oh, for a small boat when low water returns.
  6. This past weekend was the 50th annual Rutgers Geology Museum open house, which was an excellent opportunity to attend guest lectures by professionals and also a chance see the museum's collection. The event was very well attended, and in between lectures (the lecture by Dr. Isaiah Nengo on his work with Nyanzapithecus alesi was excellent) seeing the museum was a hurried, crowded affair. The museum building is a tall 19th century structure with many large tall windows, so on this sunny Saturday sun glare on the glass cases was unfortunately a real and unavoidable problem. Nevertheless, I made an effort to get some photos of the museum to share with TFF. The Mastodon is a Salem County NJ find. Particularly exciting for me as a huge fan of Phytosaurs was seeing their specimen of Rutiodon manhattenensis, which despite its specific name was found on the New Jersey side of the Hudson. Yet another example of New York stealing New Jersey's credit! Hidden in a corner (it was packed in there, things crammed into corners to make room for tables) was a skull of Mosasaurus "maxmimus" which I'd have loved to known more about since it was apparently a New Jersey find. Alas, no more info than that. Next to it was a cast of the original find Mosasaurus hoffmanii from the Netherlands, which was neat to see in real scale.
  7. My sons friend did some work on my big tractor and I told him I would prep out one of my sons ammos for him. I cant do any scribe work till i get my compessor back to working, but i was able to do some grinding on it, some glue up work and a small bit of 2 part putty. Still gots a ways to go though. A 15 incher RB
  8. Here is what my son brought home yesterday. Freakin Huge!!! Its missing most of the fragmacone, but it measures 24 inches! I popped off the rest of the rock on the 'top side'. Only took about 5 minutes and you can see that it is a bit crushed, but after talking to my ammonite buddy, he tells me that another ammonite of the right size and the right prezervation that he can make it look whole again. And believe me, this guy is a master at putting two different ammo's together!!! Just might turn out to be a purty dang nice ammonite? Oh, and I saved all the rock that came off this thing in order to put shell material back on. You cant see it, but there is lots of color!!! Gunna be a job though. Once done, it will be in my sons house. Purty dang heavy also!!!! RB
  9. This morning I was moving some of my fossil crab concretions around and tryin to orginize a bit and ran into this Beauty! It had collected a bunch of dust. I had to wash it off even! Now, finally, its in the house. Just wish these pics could do the color on this thing some justice, but im not good at photography. Its got some wonderful purples that you can not see. My son found this many years ago and it took me many hours of prep with lots and lots of sanding and then a coating of some kind of 2 part system, but it came out purty good. RB
  10. This thing sat in a box for quite awhile. It was a concretion that was 'popped' open but broke very badly! There were two incomplete halfs of this concretion with some ammo material on both halves and lots of left over pieces too. About two months ago I took a chisel and did my best to 'pop' off the ammo parts still on the rocks. I then layed out all the pieces in such a way and realized I had a complete ammo. So,,,,, took many many days but kept gluing pieces back together. I really did think about tossing this into the rock pile a time or two. Once I finally had it all put back together I had to start the 2 part putty attack. Then lots of sanding, then a coat of wax. I finished up only one side of this specimen yesterday and called it quits. I just couldn't see putting any more time into this darn thing. Then last night, about 3 am, I started thinking about how all the hard stuff is done, so why not finish up the other side? Plus, I think it may be the better side. And I would end up with a 'Two Sider'. RB
  11. From the album Ammonites & Ammolites

    75 - 72 mya, Bearpaw Formation, Rocky Mountains, Canada,
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