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Ammonite Mariella brazoensis Grayson Formation
JamieLynn posted a gallery image in Member Collections
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From the album: Texas Cretaceous Fossils: Ammonites and Nautiloids
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Grayson formation nautiloids- Tarrant County TX
Shaun-DFW Fossils posted a topic in Member Collections
I would love to learn from some of you regarding what species of nautiloids these are (maybe multiple species). They’re different than the larger ones I find more often in similar areas and I like the pattern detail visible on some of them. They almost always have a very distinct curve at the outer edge. These are mostly from 2 spots in burleson TX. The unusual nautiloid with lots of details visible and crystallized (looks brown in the photo) on the inside was from a different spot (maybe Fort Worth formation?) where I find mortoniceras ammonites.
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I made a lunch break stop by my local rec center drainage ditch and found one of the larger pectins I’ve found. In the past, I found big nautiloids here too. I nicknamed the little gastropod guy “curly” and I also have one of the tiniest little turrilites (I think it’s a turrilite?) attached to the back of another fossil. The echinoid isn’t in great shape, but I only have 3-4 of these so I took it anyway. Tarrant county, TX
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Beginners luck: one of the very first ammonites I found in March of this year is apparently quite rare, in fact, I’ve never found one since - Graysonites lozoi. I believe the Grayson Formation, where I found this, typically only has nautiloids, and some nice oysters. It’s not in great shape, and I haven’t even tried to remove any matrix, but it’s still an interesting ammonite that looks a bit different from the typical Mortoniceras ammonites I find. Location is Tarrant County, actually in Burleson where I live.
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I previously posted my woodbine ammonite collection (calycoceras/conlinoceras). I’ve since sliced 2-3 that were without hope of reflecting external beauty, for lack of a better description as to why. Haha..I find a lot of nautiloids where I live due to proximity to Fort Worth/Grayson formations. Oftentimes, the spots that have mortoniceras ammonites also have occasional nautiloids. I exposed a small amount of crystallization while removing this nautilus, so I experimented with slicing this one. I’m glad I did! What a beauty. I have plenty of whole specimens (some QUITE large) that will stay whole, but this one is unique!
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After finding my pyritized ichthyosaur vertebra in the Grayson Formation last Friday, I decided that it was time to revisit previous exposures I had first discovered three years ago with a fresh set of eyes. I made a trip to several of those spots the following Saturday and one of the fossils I found is another vertebra. I initially wrote it off as a fish vertebra because it was so thick, then decided it wasn't flaky enough to be fish and the two holes on one side meant it must be a shark centrum, then thought maybe it could be an ichthyosaur caudal, and as of now I think it might be a plesiosaur caudal. As you can probably tell, I can be pretty indecisive! I also promise that the grooves on the face of the vertebra going towards the center weren't slips with the dental pick I was using; they were already there. It's about half an inch in diameter and a quarter of an inch thick. Let me know what you all think. This thing has me stumped!
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Here are some of my finds from spending a few hours on Wednesday, October 26th, in the Graysonites wacoense Zone of the Grayson Formation, Washita Group of north Texas (Early Cenomanian, ~97mya). This particular site exposes a micromorph layer full of thousands of tiny dwarfed Mariella bosquensis and M. rhacioformis ammonites plus a wealth of other taxa like various urchins, brittlestar fragments, shark teeth, many gastropods & pelecypods, etc. Those familiar with the Del Rio exposures of further south in central Texas (particularly the now closed-to-public Waco Pit in McLennan County), should recognize much of the fauna to be found at this site as it is laterally equivalent to those and faunally nearly identical, differing only slightly in the rarity of homomorph ammonites at this site vs further south, as well as slight differences in preservation/lithology. The following is just a fraction of what I found: One of thousands of dwarfed Mariella bosquensis (Turrilitidae) ammonites: Cretalamna cf. catoxodon (Otodontidae) shark tooth, this species was first described from the Cenomanian of Western Australia by Siversson et al., 2015 where many species were split out of the broad C. appendiculata: Goniophorus scotti (Saleniidae) sea urchin fragment: A tiny Stoliczkaia texana (Lyelliceratidae) ammonite: Arm fragments of Ophiura graysonensis (Ophiuridae), a brittlestar. I hope to find a complete specimen or at least a central disk at this site soon: Another Goniophorus scotti (Saleniidae): Some more dwarf Mariella bosquensis (Turrilitidae) ammonites: Found in just a few seconds of searching in one spot: Neithea texana (Neitheidae) scallop: Praescabrotrigonia emoryi (Pterotrigoniidae) clam: cf. Margarites (Margaritidae) gastropod: A very small Cymatoceras hilli (Cymatoceratidae) nautiloid: Imprints of the pellet-lined burrows of mud shrimp (the ichnogenus being Ophiomorpha). These almost certainly belong to Meticonaxius rhacheochir (Micheleidae) which is known from both the older Pawpaw Formation and the younger Britton Formation, the latter of which contains abundant identical Ophiomorpha which have been found with the bodies of M. rhacheochir preserved inside: Chondrites trace fossils: Bivalve shell fragment conglomerate slabs consisting mainly of Texigryphaea roemeri oyster and Neithea texana scallop fragments: A mass of white nodules which I presume are likely fossilized rhodoliths, structures made up of the calcium carbonate secreted by coralline red algae which would freely roll around on the sea floor: Hundreds of Texigryphaea roemeri (Gryphaeidae) oysters: The layers above the micromorph zone abound with more typical Grayson Formation lithology & fauna, such as this Mariella rhacioformis (Turrilitidae) ammonite fragment. This species occurs in abundance in at the site in the more typical layers and occasionally as limonitic/pyritic micromorphs too: A portion of a typical non-dwarfed Mariella bosquensis (Turrilitidae) ammonite: Protocardia texana (Cardiidae) clam:
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From the album: Lake Waco Research Area
Cidaris hemigranosus (?) -
From the album: Lake Waco Research Area
Collected over several trips to the research area; shows the diversity of fossils that can be found within the pit. Present are two ammonites (the Submantelliceras is the largest I've ever seen), a heteromorph, a brittelstar central disc with the bases of the arms still attached, internal molds of two gastropods and a small bivalve, an anterior tooth from Cretalamna appendiculata, a small cidarid echinoid, a fish/shark vertebra, a bryozoan encrusted fragment of oyster shell, and one half of a squid beak. -
From the album: Lake Waco Research Area
Possibly Protosphyraena, Pachyrhizodus, or a lateral Enchodus tooth. -
From the album: Lake Waco Research Area
Top row (from left to right): Cretodus semiplicatus, Scapanorhynchus texanus, Scapanorhynchus raphiodon, Carcharias amonensis Second row: Cretalamna appendiculata (anterior teeth) Third row: Cretalamna appendiculata (lateral teeth) -
From the album: Lake Waco Research Area
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From the album: Lake Waco Research Area
Anterior tooth -
From the album: Lake Waco Research Area
Anterior tooth -
From the album: Lake Waco Research Area
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From the album: Lake Waco Research Area
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From the album: McClennan County, Texas
Sea urchin; inner view of half of the aboral (bottom) side of the test. -
From the album: Lake Waco Research Area
Anterior tooth-
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From the album: Lake Waco Research Area
Anterior tooth -
From the album: Lake Waco Research Area
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From the album: Lake Waco Research Area
Anterior tooth -
From the album: Lake Waco Research Area
Anterior tooth -
From the album: Lake Waco Research Area
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From the album: Lake Waco Research Area
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From the album: Lake Waco Research Area
Anterior tooth
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