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Found 5 results

  1. Over the weekend I tried some new Fox Hills and Cannonball Formation sites as well as returning to a couple old ones. Most of the new Fox Hills site was covered in abundant Ophiomorpha, a decapodian trace fossil very typical for parts of the Fox Hills. Abundant free weathered pieces of the burrows. There was a rather large Crassostrea subtrigonalis oyster bed on the property. A common fossil in the upper Fox Hills but I don't often see them in the abundance of this site (fragments in the thousands). All white/sharp edges you see are oysters. The Prickly Pears are now fruiting here. I only grabbed a handful of the most attractive individuals. The black/grey sheen on some is very pretty. An Anomia micronema was attached to the matrix on one as a bonus.
  2. I lined up a couple more properties over the weekend so I made another trip out to exposures of the Cannonball Formation (Paleocene) and Fox Hills Formation (Upper Cretaceous). I only planned for two properties but the first was so large (an entire section with many outcrops) that I figured this was fine. It was a nice morning and much of the haze from the Canadian wildfires has subsided. Junipers often creeped over sandstone concretions on the cliffs. A slump exposure of Cannonball Formation viewed from the top of another exposure. The top of hills were often capped with hard sandstone. Loosely consolidated and worn sandstone in lower layers had abundant shell fragments but not much else. A couple more complete fragments might be identifiable. Distinctly bedded sandstone. A nice hike even if the fossils weren't good. Another hour long drive and I was at the Fox Hills site. Fossils were loaded here. Some free-weathered (these are compressed Protocardia subquadrata)... ...and lots in concretionary layers. There's quite a bit I brought back to prepare. Species I've noticed just in the outer concretion include indet. fish scales, Mactra warrenana, Piestochilus feldmani, Protocardia subquadrata, Pteria nebrascana, Pteria linguaeformis, Cucullaea shumardi, and Euspira sp., A split Hoploscaphites (~6 cm). I brought back the entire concretion intact. To the left are Mactra warrenana and below is wood. Some concretions were massive. This one was a little under a meter long. And unfortunately contained a worthy specimen. Unable to remove the whole concretion I removed the layers containing the ammonite by chisel. Annoyingly the ammonite went through both the outer concretion layers (already separated in part) and the inner layers so the layers will have to be reconnected during prep. It's about 8 cm long complete. The gem of the day is this ammonite which I originally thought was a Placenticeras. Despite the preservation it is an excellent find. It did require multiple repairs as I found it in multiple pieces. A puzzle and some glue later and I have this. It is difficult for me to imagine based on my experience but there are some reports of massive Sphenodiscus from the Fox Hills as well as Placenticeras being present although I haven't found any scholarly sources to back this up yet. Some sources claim they disappear before the Fox Hills. It seems I'll have to do some research when I get the time. Outer concretionary layer removed (other side is solid sandstone). Some "body" removed (outer shell adhering to other side). Removed body. Continuing up the hill there is another exposure, this time of the Timber Lake Member that represents brackish transition. Cattle trails were littered with Crassostrea subtrigonalis. No other species found.
  3. Continuing from my recent trips to outcrops of the Cannonball Formation I made my way South towards the area of the Cannonball Formation type locality. I stopped at a couple roadcuts in Morton County on the way down but spent most of the day on the Cannonball River in Grant County. A burrowing owl off a country road. I believe this is Escobaria missouriensis among Cannonball sandstone. It isn't one of the species of cacti I frequently see. The only fossil that came from here is Nototeredo globosa bored wood(?). Pictures don't properly show how steep the outcrop at this site is. The only material found here was shell fragments that are fragmentary even by Cannonball standards. Most of the way up. From the top. Another hike in elsewhere and another Cannonball River cutbank. Trace burrows in a sandstone ledge that fell from the outcrop. There wasn't much here either, just some shell fragments. Pretty typical for the Cannonball in my experience.
  4. I was eager to get out before the heatwave coming up so I made the visit to a couple new Cannonball sites the other day as well as property adjacent to where I collected the crabs this spring. I was expecting more good bivalve material from the first sites but I'm pretty happy with the results regardless. Sort of a continuation of this topic. I tried a few cuts before working my way down to the area I found the concretions in before. The material in all was extremely fragmented. I still need to bust that concretion. One of the inconspicuous cuts. More fragments. A worn Ophiomorpha? I did find a worn Carcharias taurus tooth at this site which made it worth the stop. Down in the familiar area I had immediate luck as the first concretion I busted had a shark tooth. It broke the tooth but the break is clean and should made for an easy repair. Here's a crab (Camarocarcinus arnesoni) that was already split. This is the only split concretion I saw that contained a fossil. The white material obscures it a bit but the last one I prepped like this had the normal black color and carapace texture once I abraded away the white. This should clean up pretty nicely. An example of a concretion. Prickly pears, purple prairie coneflower, and prairie roses were all in bloom as well. Concretions show variety in color, texture, and shape but there doesn't appear to be a correlation with any of these characteristics and which ones contain fossils. The ratio of fossils to blanks was higher than last time but still not enough to warrant preparing the concretions directly. Got to split them all first and glue them back together as necessary. These two were blanks. This pretty one was not. Tiny (5 mm) fish vert. Hard to see but the faint outline is probably a crab. Otodus obliquus, a new species for me. A gnarly piece of petrified wood, probably float material from somewhere. Common Nighthawk eggs I believe.
  5. On the 1st I had the opportunity for another trip and made it out to Morton County. I was waiting until now to post the report because I wanted to finish preparing a crab to include in the report but I've been busy. I went to one Fox Hills Formation site but mostly I had sites lined up from the Paleocene Cannonball Formation and some Fort Union Group formations. Compared to Emmons County across the Missouri River there is less Fox Hills Formation and it is replaced mostly by the overlying Hell Creek Formation and Paleocene units. Some scenery showing outcrops of the Cannonball Formation at one of the sites. Outcrops are common but fossils in the formation are rather slim pickings. Small crab bearing concretions have been reported from the Cannonball Formation once in the past but the sites where they were collected and the species described has since been destroyed. A shame considering the overall rarity of crabs from the interior seaways and North Dakota overall. The concretions were instantly recognizable at this site but were sparsely fossiliferous. Because of that I was splitting most of the concretions in the field. Persistence did pay off and as I was about to give up I did come across a crab. Later I glued the concretion back together to prep it. After preparation. I was hoping for a more complete and well preserved crab (something like Washington crabs) but considering the rarity I really can't complain. This is Camerocarcinus arnesoni. A carpus underneath the carapace. I also found a manus in the concretion. An internal mold of Arctica ovata from a nearby site. Only one other Arctica was found. There is one more crab bearing concretion to prep but it appears to be much more partial. There's also some concretions I was unable to split in the field so I brought back to exert more muscle on them. Hopefully there will be more stuff.
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