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Found 5 results

  1. Fossil Armor

    From the album Macro Florida Fossils

    I think this is crocodilian
  2. The last year or so I have gotten back into fossil hunting which I loved when I was young (45 now). With a 9 year old son that loves it too (I have even converted my wife a little!). We were invited to look for fossils in a small creek accessible by foot on 4-28-18. Less than a foot deep where we dug and sifted by hand and small garden shovel for about 4 hours. Mostly found a couple hundred small sharks teeth that we will donate to a science facility here that will put them in a sand box and let children find them at a class/event. An interesting bone that looks like a socket joint piece, and a few other things... Mostly Bulls and Lemons here Cool socket of some kind (hoping I don't find out its a chicken bone someone threw in the creek!) Tube worms or coral / sponge maybe..? 4-30-18 we made our first trip to the actual Peace River and rented a canoe at The Canoe Outpost for the day. I have read about fossil hunting there a little (a good bit from this forum) and knew to look for gravel bottom and that deeper banks could be best. We just paddled north about 1.5 - 2 miles and found a nice sandy bank on the inside of a bend to put the canoe on. As I waded out I could feel the rocks crunching under my feet and it seemed to go down about 12" so we set up and started digging/sifting (1/4" mesh). Found some nice 1" teeth in the first half hour and there were generally a small tooth or two mixed with some various sizes of turtle shell etc. on each screen. Never found a real gem on the trip but did get a nice gator tooth and a few other teeth including barracuda. Some interesting bones and shell fossils that I kept as well. When I dug down I got about 12" of mud and gravel, under that was a white clay like sediment that contained nothing. I have heard digging deeper can produce better finds, maybe next time I will prod for a deeper gravel bed. All in all for not knowing much of where to go it was a great day, and I surely can't be disappointed with some nice tiger shark teeth and the Gator tooth...Also found the largest sting ray plate I have seen so far. Just one more screen full I promise! This was close to The Canoe Outpost...(We did not dig here!) The ID section of the forum helped identify the far right tooth as barracuda and the second one as alligator. The better of the teeth. Also found a couple hundred more small ones to donate. Bivalves Not sure what this is, looks like piece of broken tooth coming out of a root..... Interesting bones. turtle shell pieces I believe Not sure about this either, maybe a skin plate of some kind. My wife claimed this turtle shell fragment for the peace sign.
  3. Gator Vs Crocodile Teeth ID

    I'm sure many of you are aware of the issue concerning discerning between a croc tooth and a gator tooth. So this is my attempt to answer it, now that I've attained a varied collection. First, I will start with the popular generalizations, then I will list each of my crocodile and gator teeth and assess each one. With said data, I will hopefully deduce the best method for discernment. Though this is not meant to be comprehensive, I hope it can be used as a general guideline for identifying crocodylian teeth. The answer is not as clear-cut as you might surmise... Generalizations: -Croc teeth are more curved; gator teeth are more straight (possibly as a result of eating more fish, whereas gators eat more turtles?). This is why you can see a croc's teeth when its mouth is closed (the teeth curve around the outside of the snout and jaw) and not a gator's. -Gators have two 'seams' (carinae) 180° from each other, whereas crocs either have multiples or none. -croc teeth are more conical and sharp; gator teeth are generally blunt. Observations: Pallimnarchus pollens (crocodile) from the Pleistocene of Australia (images 1-3): -two carinae 180° from each other -sharp/pointy -curved -ovoid base Pallimnarchus pollens (crocodile) from the Pliocene of Australia (images 4-5): -two carinae 180° from each other -sharp/pointy -slightly curved -conical base Goniopholis sp. (crocodile) from Torres Vedras, Jurassic of Portugal (image 6): -multiple striations -sharp/pointy -slightly curved -conical base Alligator mississipiensis (gator) from northern Florida, Pleistocene (images 9-11): -two carinae 180° from each other -blunt (it may have been sharp at one point) -curved -conical base Alligator mississipiensis (gator) from Marion Co., Florida, Pleistocene (images 12-15): -two carinae 180° from each other -sharp/pointy -straight (not including the root) -ovoid base Alligator mississipiensis (gator) from the Pleistocene of Florida (images 16-17): -two carinae 180° from each other -sharp but rotund -straight -ovoid base Alligator mississipiensis (gator) from the Pleistocene of Florida (image 18): -two carinae 180° from each other -sharp/pointy -slightly curved -conical base Alligator mississipiensis (gator) from Bone Valley, Florida, Late Miocene (images 7-8): -two carinae 180° from each other -blunt (from wear, but was likely never sharp/pointy due to the amount of force it was using [blunt teeth would have been better for such force distribution and would have minimized wear over sharp teeth]) -straight -conical base Edit note: I have changed the identification of this tooth to Alligator mississipiensis as a result of reading this paper and deducing that Alligator would be more plausible than Thecachampsa or a posterior Gavialosuchus: https://drive.google.com/file/d/0B1HtUwlDORQ0UXZVRGJncGhwVGc/view Deinosuchus rugosus (alligatoroid/crocodylian) from the Ripley Fm., Bullock County, Alabama, Cretaceous (images 19-21): -two carinae with crenulations 180° from each other; some evidence of 'proto-seams' along the base -sharp but rotund -slightly curved -conical base Deinosuchus rugosus (alligatoroid/crocodylian) from the Ripley Fm., Bullock County, Alabama, Cretaceous (images 22-25): -two carinae with crenulations 180° from each other -sharp but rotund -straight -ovoid base Discussion: While croc teeth may generally be more slender and curved, this is not a sure-fire way to identify a crocodylian tooth as being crocodile. Crocodiles do have blunt/rotund, straight, 'stubby' teeth posteriorly (towards the back of their jaw) and these look just like an Alligator's (unfortunately, I don't have any images of the 'button-looking teeth of a crocodile, but image 16 is one of an Alligator 's). Likewise, young Alligators are known to have sharp, pointy, curved teeth (see image 18; I've seen some even more curved). Carinae/striations seem to vary for crocodiles, ranging from none (I have no such specimen to provide a photo of, unfortunately), to a consistent two, to multiple striations. I would say it's a safe bet to assume a tooth is crocodile if it has no carinae or multiple striations, as this is not seen with Alligators (which always have two carinae). In those cases where a tooth has two carinae, further deduction could be done based on the rate of rarity of each per the location, robustness, and curvature if it isn't small. It is also of note that per the paper above (kindly provided by @Plax), the ratio of height to diameter in Alligator mississipiensis teeth did not exceed 1.6. However, do bear in mind that teeth with two carinae that are small, slender, and curved could be either a crocodile or young gator, just as a robust, straight, 'button'-like tooth with two carinae could be either a posterior crocodile's or Alligator 's. Again, such deductions should be taken into account with the rarity of each per a locality. Most importantly, keep in mind that form determines function -blunt, robust teeth indicate a diet of hard-shelled prey; sharp, pointy teeth indicate a diet of slippery prey. Ask yourself if the form better indicates the lifestyle of a crocodile or Alligator found in your area (get to know your specific species!). Then take the above into account. You should be reasonably able to deduce whether you'll see the owner of your tooth later or in awhile To summarize: 1. If the tooth has no carinae or has multiple 'ridges'/seams (striations), it's crocodile. 2. If the tooth has exactly two carinae 180° apart, is small, sharp/pointy, slender, and curves, it could be a small crocodile tooth or young Alligator's. Use the above tips to help you deduce which it is (curvature, robustness, form, lifestyle, rarity of either per the locale, etc.). If it is rather robust and curves, it may likely be Alligator, given its predominance in localities such as Florida. If it is slender and curves and the locale is known for croc teeth over gator, it is likely crocodile and so on and so forth, for example. If you are within the U.S., measuring the height to diameter ratio could help rule out Alligator if it exceeds 1.6. 3. If the tooth has exactly two carinae 180° apart and is straight and rotund, it could either be an Alligator tooth or posterior crocodile's. Use the above tips to help you deduce which it is (curvature, robustness, form, lifestyle, rarity of either per the locale, etc.). Generally speaking, unless you live outside the U.S., posterior crocodile teeth will be more uncommon, especially small ones. If it is large, rotund, and straight (or only curves slightly if it isn't 'button'-like), it's probably gator unless a crocodile with a diet for hard-shelled prey is common in the area. You can also use the height to diameter ratio for this one as well. 4. If you can't tell from these deductions, it's probably a Crocogator or Allidile tooth
  4. Alligator teeth fossil or just a rock

    I'm not even sure if this is a fossil, looks like a baby alligators teeth. I do know that the teeth should have a different color than the rock. This was found in Venice Florida
  5. Calvert Formation 11/23/2013

    For those who are not familiar with the area. REF:http://www.mgs.md.gov/esic/geo/lgcp.html#tc Calvert Formation: Miocene Chesepeake Group Plum Point Marls Member: Interbedded dark green to dark bluish-gray, fine-grained argillaceous sand and sandy clay; contains prominent shell beds and locally silica-cemented sandstones. Fairhaven Member: Greenish-blue diatomaceous clay, weathers to pale gray; pale brown to white, fine-grained argillaceous sand and greenish-blue sandy clay; total thickness 0 to 150 feet. REF: http://www.mgs.md.gov/esic/geo/cal2.html Entrance Brownies Park (free after Labors day) just south of Chesapeake Beach, MD. The area I searched was from 38.679233, -76.532547 to 38.673622, -76.531034. Larger fossils were predominately located in the sandy clay ripples uncovered during low tide. I found nothing searching the ripples far than 25 feet from the high tide mark. Smaller fossils are scattered throughout the area mostly in small spoil deposits near the high tide line. Dry digging and screening did not improve my finds in this area, too much sandy clay. Here are my finding. Abundant small fossils, limited large specimens, well hunted by the locals. I will post a better picture when I return to warmer weather. I hunted at low tide. I feel hunting would be better just after high tide.
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