RWA3006
Cave Dweller
Member since March 2009
Posts: 4,175
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Post by RWA3006 on Apr 11, 2023 6:48:39 GMT -5
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Post by 1dave on Apr 11, 2023 8:54:23 GMT -5
That outer rind is so obvious, and it EXPANDED! Did it dry and crack, the cracks filled with water, then it froze to expand?
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malduin
starting to shine!
Member since June 2022
Posts: 29
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Post by malduin on Apr 14, 2023 12:28:25 GMT -5
I am contemplating planning a trip to look for some coprolites, is there any particular area you would recommend me go? I assume you find them in Utah somehwere?
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RWA3006
Cave Dweller
Member since March 2009
Posts: 4,175
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Post by RWA3006 on Apr 14, 2023 16:24:31 GMT -5
I am contemplating planning a trip to look for some coprolites, is there any particular area you would recommend me go? I assume you find them in Utah somehwere? Focus on the layers of the Morrison formation between Green River and Ticaboo. There's detailed directions somewhere in this thread but I can't remember where. Probably from a bit over a year ago I'm guessing.
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docharber
has rocks in the head
Member since October 2008
Posts: 693
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Post by docharber on Apr 16, 2023 22:35:24 GMT -5
Love this topic! I'm a retired Air Force family practitioner, and when I turned 50 15 years ago, I had my first colonoscopy done by a more senior gastroenterologist colleague who had retired several years previously. He loved his job so much he wouldn't go home and so they let him keep on working. I started a tradition then of presenting him with a piece of coprolite when I or my wife had a scope done. I told him what the stuff was and that it reminded me of him . April 6th I had my third study done at the local hospital (awake all the time- sedation's for wimps!) and continued the tradition with another former military colleague (a general surgeon), because I always liked giving him crap. He is a rarity- a surgeon who has a sense of humor. Question: what's the difference between a surgeon and God? Answer: God doesn't think he's a surgeon. Remember, M.D. stands for Minor Deity. Or Many Dollars (not always the case, anymore!). Or Malpractice Defendant.
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RWA3006
Cave Dweller
Member since March 2009
Posts: 4,175
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Post by RWA3006 on Apr 18, 2023 6:57:25 GMT -5
TURD TUESDAY
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RWA3006
Cave Dweller
Member since March 2009
Posts: 4,175
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Post by RWA3006 on Apr 18, 2023 6:57:54 GMT -5
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RWA3006
Cave Dweller
Member since March 2009
Posts: 4,175
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Post by RWA3006 on Apr 25, 2023 7:04:11 GMT -5
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RWA3006
Cave Dweller
Member since March 2009
Posts: 4,175
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Post by RWA3006 on Apr 25, 2023 7:04:53 GMT -5
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RWA3006
Cave Dweller
Member since March 2009
Posts: 4,175
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Post by RWA3006 on Apr 25, 2023 7:05:28 GMT -5
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Post by 1dave on Apr 25, 2023 8:43:12 GMT -5
Time eroded the outer surface.
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RWA3006
Cave Dweller
Member since March 2009
Posts: 4,175
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Post by RWA3006 on Apr 25, 2023 15:53:16 GMT -5
Time eroded the outer surface. It sure did, and it's plain how the tougher agate veins stand out in defiance of the weathering process.
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Post by 1dave on Apr 26, 2023 21:04:48 GMT -5
Dakota Formation / Group en.wikipedia.org/wiki/Dakota_FormationStratigraphic range: Cenomanian, around 100–95 Ma
Named for Dakota City, Nebraska by Meek and Hayden 1862[6] The Dakota is a sedimentary geologic unit name of formation and group rank in Midwestern North America. The Dakota units are generally composed of sandstones, mudstones, clays, and shales deposited in the Mid-Cretaceous opening of the Western Interior Seaway.[7] The usage of the name Dakota for this particular Albian-Cenomanian strata is exceptionally widespread; from British Columbia and Alberta to Montana and Wisconsin to Colorado and Kansas to Utah and Arizona. It is famous for producing massive colorful rock formations in the Rocky Mountains and the Great Plains of the United States, and for preserving both dinosaur footprints and early deciduous tree leaves.
Dinosaur fossils are very rare in the Dakota Formation and most[citation needed] of them come from Kansas. Some of them are found in Colorado and Nebraska. The most popular site for public viewing of Cretaceous dinosaur fossils in Colorado is Dinosaur Ridge. The best specimen is a partial skeleton of a nodosaurid ankylosaur called Silvisaurus condrayi.[28][29] Other isolated ankylosaur material may also belong to Silvisaurus.[30] Fossil dinosaur tracks are also known and include theropod and ankylosaur.[30] A large ornithopod femur is known from Burt County, Nebraska as well as fossil dinosaur tracks from Jefferson County.[31][32] Goniopholidids are also found here with Dakotasuchus kingi.[33] cf. Troodon sp cf. Paronychodon (? troodontid indet) cf. Richardoestesia sp. (theropod indet) ? Barosaurus lentus Silvisaurus condrayi – "Partial skeleton with skull, sacrum."[34] Dakotasuchus kingi - a goniopholidid.[35] Pterosaurs Pterosaurs of the Dakota Formation Taxon Presence Description Images Suborder: Pterodactyloidea[36] Tracks Known from both early and late Cretaceous strata in the Dakota Group.[36] Found at the John Martin Reservoir in Colorado.[36] Specimens kept at the Dinosaur Tracks Museum, of the University of Colorado at Denver.[36]
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RWA3006
Cave Dweller
Member since March 2009
Posts: 4,175
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Post by RWA3006 on Apr 29, 2023 9:23:55 GMT -5
Enjoying the play of light the way the sun rises and shines into my office this time of year.
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RWA3006
Cave Dweller
Member since March 2009
Posts: 4,175
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Post by RWA3006 on May 2, 2023 6:45:00 GMT -5
TURD TUESDAY You'll notice this one is larger than what I usually show. It illustrates the bland colors and contrast I usually find in specimens this size and larger. I'm at a loss for the explanation for this phenomenon. This one exhibits bug holes entering the surface.
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RWA3006
Cave Dweller
Member since March 2009
Posts: 4,175
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Post by RWA3006 on May 2, 2023 6:45:34 GMT -5
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wpotterw
spending too much on rocks
Member since September 2016
Posts: 421
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Post by wpotterw on May 2, 2023 9:27:52 GMT -5
Those are wormholes. If you enter one it will take you to a Tuesday Turd in an alternate universe.
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Post by 1dave on May 2, 2023 10:53:11 GMT -5
Perhaps the larger critters have better food selection and/or more gizzard action?
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RWA3006
Cave Dweller
Member since March 2009
Posts: 4,175
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Post by RWA3006 on May 2, 2023 18:43:42 GMT -5
Perhaps the larger critters have better food selection and/or more gizzard action? Dave, I wish I knew what it was. I've also wondered if the size affected the absorption of coloring agents like iron oxide, manganese, etc. They seem to be agatized to about the same degree regardless of size. All the different sizes I find seem to be concurrent within the same layer of strata. I don't know if it was the diet and I can't seem to find clues indicating differences.
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RWA3006
Cave Dweller
Member since March 2009
Posts: 4,175
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Post by RWA3006 on May 9, 2023 6:50:45 GMT -5
TURD TUESDAY Here's one that has extreme spider webbing and will be more of a challenge to cut. When I'm out hunting for coprolites I keep an eye open for these because they often have great patterns inside.
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