Missourian Posted May 13, 2013 Author Share Posted May 13, 2013 Surface texture on another Muncie Creek 'chicken bone': Context is critical. Link to comment Share on other sites More sharing options...
Missourian Posted May 14, 2013 Author Share Posted May 14, 2013 Shark spine Captain Creek Limestone, Pennsylvanian Clay County, Missouri Context is critical. Link to comment Share on other sites More sharing options...
Missourian Posted May 16, 2013 Author Share Posted May 16, 2013 A couple items that I posted in my 'Muncie Creek' thread.... Possible phyllocarid telson spikes Muncie Creek Shale, Pennsylvanian Kansas City metro Context is critical. Link to comment Share on other sites More sharing options...
Missourian Posted May 16, 2013 Author Share Posted May 16, 2013 .... Iridescent shell fragments Muncie Creek Shale, Pennsylvanian Kansas City metro These may be fragments of an ammonoid. The largest piece is 13 mm long. Context is critical. Link to comment Share on other sites More sharing options...
Missourian Posted May 17, 2013 Author Share Posted May 17, 2013 .... Acanthodian? fish scales Muncie Creek Shale, Pennsylvanian Kansas City metro Context is critical. Link to comment Share on other sites More sharing options...
PetrolPete Posted May 17, 2013 Share Posted May 17, 2013 .... Iridescent shell fragments Muncie Creek Shale, Pennsylvanian Kansas City metro 5830-Muncie-iridescence-1.jpg 5823-Muncie-iridescence-2.jpg 5835-Muncie-iridescence-3.jpg These may be fragments of an ammonoid. The largest piece is 13 mm long. Could they be from a gastropod? Very few of the pennsylvanian ammonites I've found have any nacre preserved on them because the layer of nacre is so thin, but most of the large gastropods I've found do have nacre still on them because the layer of nacre is thicker than on an ammonoid. Link to comment Share on other sites More sharing options...
Missourian Posted May 17, 2013 Author Share Posted May 17, 2013 On 5/16/2013 at 8:17 PM, PetrolPete said: Could they be from a gastropod? Very few of the pennsylvanian ammonites I've found have any nacre preserved on them because the layer of nacre is so thin, but most of the large gastropods I've found do have nacre still on them because the layer of nacre is thicker than on an ammonoid. It could be from a gastropod, but I don't recall ever seeing one in these concretions -- or at least an identifiable one. Context is critical. Link to comment Share on other sites More sharing options...
squalicorax Posted May 18, 2013 Share Posted May 18, 2013 Post 162 is cool! Looked at it for awhile to try to figure out what it was. Looks folded lobster. Kind of seeing crustacean segments... My Flickr Page of My Collection: http://www.flickr.com/photos/79424101@N00/sets Link to comment Share on other sites More sharing options...
Missourian Posted May 22, 2013 Author Share Posted May 22, 2013 .... Crustacean (phyllocarid?) Muncie Creek Shale, Pennsylvanian Kansas City metro Concretion part and counterpart: Mosaic of two images (counterpart): A smaller crustacean, possibly offspring, can be seen just to the right. Close-up of the carapace and legs (counterpart): Carapace and legs again (part): Two 'offspring' (part): Context is critical. Link to comment Share on other sites More sharing options...
Missourian Posted May 22, 2013 Author Share Posted May 22, 2013 While taking a close-up look at some epifauna on a Cretaceous inoceramid clam fragment: I spotted a number of tiny forams.... Globigerina sp.: Gumbelina sp.: They are well under 1 mm. Smoky Hill Chalk, Cretaceous Trego County, Kansas Context is critical. Link to comment Share on other sites More sharing options...
Missourian Posted May 25, 2013 Author Share Posted May 25, 2013 Cirripedes, a.k.a. barnacles Smoky Hill Chalk, Cretaceous Trego County, Kansas We come back to the inoceramid fragment shown in the post above: Along with forams, cirripedes can be found. These little guys are no larger than 2 mm.... Little groups of plates caught my eye: Attached to the plates are what look like bishop hats: Two individuals: Two stuck together: At least four: At least seven: An example of a larger specimen, also found in the Cretaceous of Kansas (image found on Google): More info at http://www.thefossilforum.com/index.php?/topic/37635-cretaceous-cirripedes-from-kansas/ Context is critical. Link to comment Share on other sites More sharing options...
lissa318 Posted May 25, 2013 Share Posted May 25, 2013 Wow very cool Missourian!!! And you take such great pictures! Link to comment Share on other sites More sharing options...
Missourian Posted May 27, 2013 Author Share Posted May 27, 2013 On 5/25/2013 at 0:04 PM, lissa318 said: Wow very cool Missourian!!! And you take such great pictures! Thanks. I still can't believe the little cam in the iPhone can take photos like that. Context is critical. Link to comment Share on other sites More sharing options...
Missourian Posted May 27, 2013 Author Share Posted May 27, 2013 Crinoid anal sacs Aesiocrinus sp. Liberty Memorial Shale, Pennsylvanian Wyandotte County, Kansas Context is critical. Link to comment Share on other sites More sharing options...
Missourian Posted June 6, 2013 Author Share Posted June 6, 2013 Algal-foraminiferal oncolites Osagia sp. Farley Limestone, Pennsylvanian Clay County, Missouri Osagia are tiny oncolites, which are accumulations of algae (most likely Girvanella sp.) and forams (principally Tolypammina sp.): They formed around nuclei (sedimentary clasts, shell fragments, etc.) and grew as they rolled around in a high-energy environment, probably in shallow water above the wave base. Through the microscope, the snake-like Tolypammina can be seen in the oncolites: Closer still: The forams stand out nicely, but the Girvanella filaments are too small to see at this magnification, assuming any of their stucture is preserved at all. Context is critical. Link to comment Share on other sites More sharing options...
Missourian Posted June 23, 2013 Author Share Posted June 23, 2013 Shark fin Muncke Creek Shale, Pennsylvanian Kansas City metro Context is critical. Link to comment Share on other sites More sharing options...
Missourian Posted June 24, 2013 Author Share Posted June 24, 2013 Another shark fin Muncie Creek Shale, Pennsylvanian Kansas City metro Under the microscope, there appears to be some fabric-like stuff covering the skeletal elements: What in the world? Zooming in reveals a myriad of barbs: These are dermal denticles, which are basically sharp scales that give shark skin a sandpaper-like quality: The lower end of the fin is broken off, revealing the internal structure of the skeletal elements: Context is critical. Link to comment Share on other sites More sharing options...
Missourian Posted June 25, 2013 Author Share Posted June 25, 2013 Another fin? I'm not sure if this is a fin or a bone/element with some interesting structure: I didn't make out any denticles in the smooth area. Context is critical. Link to comment Share on other sites More sharing options...
Missourian Posted July 10, 2013 Author Share Posted July 10, 2013 These were originally posted on my 'Muncie Creek' thread here: http://www.thefossilforum.com/index.php?/topic/25758-phosphatic-concretions-of-the-pennsylvanian-muncie-creek-shale/?p=423675 . They belong here as well.... Actinopterygian fish brain castLawrenciella sp. (schaefferi?) Muncie Creek Shale, Pennsylvanian Kansas City metro (Specimen #1 is here: http://www.thefossilforum.com/index.php?/topic/33865-adventures-in-microscopy/?p=375885 ) Specimen #2: Note the area marked with a green arrow. Up close, some interesting detail can be seen: Specimen #2 again. Note the arrows: Specimen #2 detail (red arrow): Specimen #2 bone structure (blue arrow): TFF member Plantguy pointed out these features in the Muncie thread: They are probably canals that contained blood vessels and possibly nerves. Here are a couple close-ups: A couple more specimens.... Specimen #3: Specimen #4: Up close: Other side of specimen #4, showing top of cranium: Up close: Context is critical. Link to comment Share on other sites More sharing options...
Missourian Posted July 12, 2013 Author Share Posted July 12, 2013 Undetermined (fish fin?) Stark Shale, Pennsylvanian Jackson County, Missouri I think this is a fish fin or tail, but I'm not quite sure. The image is 22 mm wide: A little closer: Detail of a nearby but isolated fragment: Context is critical. Link to comment Share on other sites More sharing options...
Roz Posted July 12, 2013 Share Posted July 12, 2013 Undetermined in concretion Liberty Memorial Shale, Pennsylvanian Clay County, Missouri 4825-Liberty-undet-1.jpg 4834-Liberty-undet-2.jpg I thought this could be fish material, but under magnification, it appears to be shelly or even chitinous. The concretion is 12 mm in length. It reminds me of the shell material of a nautiloid. Welcome to the forum! Link to comment Share on other sites More sharing options...
Missourian Posted July 13, 2013 Author Share Posted July 13, 2013 Shark dermal denticle Listracanthus sp. Stark Shale, Pennsylvanian Jackson County, Missouri Some call these 'feather' denticles: Context is critical. Link to comment Share on other sites More sharing options...
Missourian Posted July 13, 2013 Author Share Posted July 13, 2013 They can be distinguished from fins by their flat bases: These are fairly common in the Stark Shale. They are probably present in other black shales in the area as well. Oddly, as far as I can recall, they haven't turned up among the diverse fauna of the Muncie Creek Shale. Perhaps the mode of preservation of the concretions renders them unrecognizable. Context is critical. Link to comment Share on other sites More sharing options...
Missourian Posted July 13, 2013 Author Share Posted July 13, 2013 Shark dermal denticle: Petrodus sp. Little Osage Shale, Pennsylvanian Bates County, Missouri Quite unlike Listracanthus, these denticles resemble little chocolate kisses: Up close: These are common in the Desmoinesian Stage, but seem to be lacking in the overlying Missourian Stage rocks of the Kansas City metro. Context is critical. Link to comment Share on other sites More sharing options...
Missourian Posted July 13, 2013 Author Share Posted July 13, 2013 On 7/12/2013 at 0:04 PM, Roz said: It reminds me of the shell material of a nautiloid. Orthocone does come to mind, but there isn't anything diagnostic to key on. Context is critical. Link to comment Share on other sites More sharing options...
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