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Showing results for tags 'graham formation'.
Found 11 results
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I found this bivalve at the Lost Creek Spillway in Jacksboro Texas, Graham Formation. It's 30mm across and it came attached (post-mortem) to a nautiloid fragment. It has been suggested that it could be Pseudomonotis sp. possibly based on it's inclusion on the fauna list but it sure looks more like either Dunbarella rectilaterarius or D. knighti neither of which are know from the site. Maybe it is some species of Pterinopecten from the Pennsylvanian if there are any. Any help would be great.
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Stenopoceras, nautiloid from the Finis Shale of Texas
BobWill posted a topic in General Fossil Discussion
I found my first Stenopoceras sp. from the Finis Shale member of the Graham Formation at Jacksboro Texas. I thought it was an oddly-shaped version of the more common Grypoceratid from there, Domatoceras scuptile until I noticed the concave venter. I went through my drawer of Domatoceras fragments and found another partial one after I studied the differences a little. That one was just part of one side and had nothing of the venter but a part of the apertural margin was showing, something I don't remember seeing before. Both are external casts so no sutures but the faint growth lines are visibl- 4 replies
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- pennsylvanian
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I showed Jeffery P the Jacksboro spillway on his swing through Texas and it was my day to find plants in this otherwise marine site. At least I think that both are plants. First this piece with mm scale which I'm guessing could be Cordaites or Artisia pith. Edge view and close-up and other side Next this leaf which I think is one of the seed fern pinnules, also with mm scale other side end views and side views
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I'm having trouble getting the right name for this tiny Goniatite from Jacksboro Texas. Upper Pennsylvanian, Finis Shale Member of the Graham Formation. Small at only 7mm.
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- finis shale
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This is a less common brachiopod collected at the rich Finis Shale site in the spillway of the Jacksboro Reservoir. It is often confused with the more common Composita subtilita which has a stronger sulcus fold and no small spines.
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I thought I posted this before but couldn't find it, maybe it was on facebook. It also seems like I've recently seen something similar but don't know where. Must take better notes... Closer in Closer still to wrinkled end on the right The image after this is looking in the direction of the arrow at the layers visible on the edge edge view
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Photo featured in "Marine Shark" section of Color Guide to Pennsylvanian Fossils of North Texas by Mark McKinzie and John McLeod. Labial face. Missing root and extreme tip on right end of photo. EDIT: Pennsylvanian is Subperiod, Late is Epoch.
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This is a large specimen of a common brachiopod with encrusting Serpula sp. collected at the rich Finis Shale site in the spillway of the Jacksboro Reservoir.
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Polly M. is the fieldtrip leader for the Dallas Paleontological Society. She found this Pennsylvanian Period snail and we don't know it's name.
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I have no idea what this could be. I found it at the Lost Creek Dam site in the darker shale on the east end of the slope. It's 11mm long and has a very shiny, dark surface. This end is distorted. Other end.
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A co-worked of mine has a deer lease near Bangs, Tx (just west of Brownwood). He says the lease is full of very large rocks that have fossils embedded in them and while out this past weekend, he found this item. He sent me a photo knowing I love hunting fossils but this is way out of my knowledge base. I have never been out to the Brownwood area to hunt fossils but after hearing about what he's seen, it's definitely on my list of places to hit now. Based on what I've learned, it appears the lease sits in the Thirfty and Graham formations but I cant say that with 100% certainty
