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From the album: Mark's Mazon Creek Fossils
BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SEGMENT OF PINNA. WEATHERED. SPECIMEN 40mm X 25mm (2-3/8" x 1").-
- francis creek shale
- mazon creek
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From the album: Mark's Mazon Creek Fossils
BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPECIMEN 25mm X 10mm (1" x 3/8"). CONVEX HALF BROKEN & GLUED.-
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- francis creek shale
- mazon creek
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From the album: Mark's Mazon Creek Fossils
BOTH HALVES SIDERITE CONCRETION, SPLIT BY FREEZE/THAW METHOD & LIGHT HAMMER BLOW. SPECIMEN 25mm X 9mm (1" x 3/8").-
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- francis creek shale
- mazon creek
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From the album: Mark's Mazon Creek Fossils
BOTH HALVES SIDERITE CONCRETION, SPLIT BY FREEZE/THAW & LIGHT HAMMER BLOW. SPECIMEN 71mm X 10mm (2-13/16" x 7/16"). ACETIC ACID BATH APPLIED.-
- francis creek shale
- mazon creek
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From the album: Mark's Mazon Creek Fossils
FOUND AS IS, SPECIMEN 65mm x 60mm (2-9/16" x 2-3/8"). ALBUMEN APPLIED.-
- francis creek shale
- mazon creek
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From the album: Mark's Mazon Creek Fossils
FOUND AS IS. SPECIMEN APPROXIMATELY 50mm x 50mm (2" x 2").-
- francis creek shale
- mazon creek
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From the album: Mark's Mazon Creek Fossils
BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. BUTTERFLY POSITION, SPECIMEN APPROXIMATELY 26mm X 25mm X 3.5mm (1" X 1" X 1/8"). CONCAVE HALF BROKEN & GLUED. HYDROCHLORIC ACID BATH -- OVERDONE.-
- francis creek shale
- mazon creek
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Again, asking the usual bunch for assistance with ID. @bigred97 @connorp @deutscheben @fiddlehead @flipper559 @Nimravis @Plantguy @RCFossils @stats @TheRocksWillShoutHisGlory Thanks in advance. Mark.
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- francis creek shale
- mazon creek
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This is probably an extremely long shot, but I wanted to post these interesting pics in case they ring a bell for anyone. These were all found in a Late Pennsylvanian shale associated with the Herrin Coal, which generally preserves plant fossils. I’m not sure if they are fossils or diagenetic artifacts- the shale is baked on the spoil pile which can introduce unusual shapes. The first one is a strange pattern- it appears to be asymmetrical and doesn’t immediately match any plant parts I’m familiar with, but there are so many possibilities I might be missing something. It’s 5 mm wide. This next one is part and counterpart of a smooth cylindrical impression- the entire visible impression is about 15 mm long. These next three could be a result of the heating of the shale, which can produce bubbles and smooth surfaces like these, but it would unusual for that to be the case without any other distortion around it. The final impression comes from the other side of one of the pieces above and is similarly smooth-walled, but only a small portion is visible.
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- carboniferous
- illinois
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From the album: Llewellyn Formation
Pecopteris Schuylkill County, Pennsylvania-
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- llewellyn
- pecopteris
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5 Mazon Creek specimens that need confirmation or species ID
Mark Kmiecik posted a topic in Fossil ID
Another five that I'm not sure of that need an ID or confirmation. Calling on the usual Mazon Creek gang, @bigred97 @connorp @deutscheben @fiddlehead @flipper559 @Nimravis @Plantguy @RCFossils @stats @TheRocksWillShoutHisGlory and anyone else who can help. Thank you in advance for taking a look.- 6 replies
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- francis creek shale
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Hello all! Found this odd little thing in Pennsylvanian formation of Texas. It looks like crinoid, but not exactly. There's really no segmentation that I can see. The little flanges seem irregular. Any help will be appreciated!
- 10 replies
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- fossil
- pennsylvanian
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Before going back to the ESCONI Gem and Fossil Show, I decided to leave the house early and make the 75 minute trip to Oglesby, Illinois to a roadcut that I like to collect and was last there 19 days ago. This roadcut, exposes the Pennsylvanian LaSalle Member of the Bond Formation. Within those 19 days, portions of the head wall came down, dropping several thousands of pounds of rock. As I have stated in previous posts, this is not a road cut for younger collectors and people who are not sure-footed. Here are a few pics of the exposure as I found it this morning. This tree branch….. broke off of this tree after being hit but a lot of rock. The rock that I am holding broke off of the larger piece in the background during the fall. The large boulder in the left of the picture that has my Estwing stick on top fell all of the way down to the base of the cut. I am guessing that it is a distance of about 50+ feet. Here are a couple pictures of some of my finds. Three different species of brachiopods in this freshly freed piece. Here is my first Conularida and it is next to an inarticulate brachiopod. I will post a better pic at the end of the post.
- 25 replies
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- 7
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- brachiopods
- oglesby illinois
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From the album: Mark's Mazon Creek Fossils
BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPECIMEN 42mm X 35mm (1-5/8" x 1-3/8").-
- francis creek shale
- mazon creek
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From the album: Mark's Mazon Creek Fossils
CONVEX HALF SIDERITE CONCRETION, FOUND AS-IS. SPECIMEN 71mm X 20mm (2-13/16" x 13/16").-
- francis creek shale
- mazon creek
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(and 3 more)
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From the album: Mark's Mazon Creek Fossils
BOTH HALVES SIDERITE CONCRETION, SPLIT BY FREEZE/THAW METHOD & LIGHT HAMMER BLOW. SPECIMEN 78mm X 17mm (3-1/8" x 11/16"). ACETIC ACID BATH APPLIED.-
- francis creek shale
- mazon creek
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(and 3 more)
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From the album: Mark's Mazon Creek Fossils
BOTH HALVES SIDERITE CONCRETION, SPLIT BY FREEZE/THAW METHOD. SPECIMEN 95mm X 30mm (3-3/4" x 1-3/16").-
- francis creek shale
- mazon creek
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From the album: Mark's Mazon Creek Fossils
BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPECIMEN 35mm X 23mm (1-3/8" x 7/8").-
- francis creek shale
- mazon creek
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From the album: Mark's Mazon Creek Fossils
BOTH HALVES SIDERITE CONCRETION, SPLIT BY FREEZE/THAW & LIGHT HAMMER BLOW. SPECIMEN 75mm X 24mm (2-15/16" x 15/16"). ACETIC ACID BATH APPLIED. OILED.-
- francis creek shale
- mazon creek
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From the album: Mark's Mazon Creek Fossils
BOTH HALVES SIDERITE CONCRETION, SPLIT BY FREEZE/THAW & LIGHT HAMMER BLOW. SPECIMEN 75mm X 14mm (2-15/16" x 9/16"). ACETIC ACID BATH APPLIED.-
- francis creek shale
- mazon creek
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From the album: Mark's Mazon Creek Fossils
BOTH HALVES SIDERITE CONCRETION, SPLIT BY FREEZE/THAW & LIGHT HAMMER TAP. SPECIMEN 67mm X 21mm (2-5/8" x 13/16"). PROXIMAL END OF BOTH HALVES BEGAN CRUMBLING DURING STORAGE. ACETIC ACID BATH APPLIED. OILED W/MACHINE OIL.-
- francis creek shale
- mazon creek
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From the album: Mark's Mazon Creek Fossils
BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPECIMEN 55mm X 35mm (2-1/8" x 1-3/8"). TWO INCOMPLETE WHORLS.-
- francis creek shale
- mazon creek
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From the album: Mark's Mazon Creek Fossils
BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPECIMEN 54mm X 12mm (2-1/8" x 1/2").-
- francis creek shale
- mazon creek
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Two weeks ago I decided to make a weekend trip to several Pennsylvanian and Cretaceous sites in North Texas. I had these sites on my list to visit for a while so it was nice to get to finally check them out. Fortunately @BobWill was nice enough to meet me at Jacksboro on the Saturday. Being my first ever trip to Jacksboro, it was nice to have someone with me with some experience and expertise on the site. Bob kindly told me that it was uncommon to find vertebrate material at the site, but that still didn't stop me from finding the root of a petalodont tooth and the base of a cladodont tooth! On my drive to Jacksboro, I stopped at a couple Pennsylvanian sites near Lake Bridgeport. I first stopped at two exposures of the Jasper Creek Shale. My best find was a dorsal cup of a Delocrinus pictus crinoid. From there I visited three exposures of the Lake Bridgeport Shale. It was fun to sort through the broken concretions and pick up some of the colorful gastropods that had weathered out of them. I even found a tiny pygidium of the trilobite Ditomopyge scitula! Glabrocingulum sp. Straparollus pernodosus Ditomopyge scitula Waking early Saturday morning I beat Bob to Jacksboro but that gave me enough time to quickly eat my breakfast and put my gear on. Being close to the water there was a bit of a chilly breeze in the morning but the weather quickly turned once the sun came out in full force. It was truly a beautiful day to be out fossil collecting. I spent the better part of the day crawling around the site, trying my best to put eyes on every nook and cranny of the exposure. I had read a lot about the diversity and abundance of fossils at the site, and it surely did not disappoint. Here are some of my favorite finds: The aforementioned cladodont Glikmanius occidentalis tooth as found Fortunately all of the pieces went back together nicely! The aforementioned petalodont Petalodus ohioensis tooth I got a little carried away looking for the bigger cephalopods at the site but did manage to find a few Eoasianites sp. and Imitoceras grahamense goniatites Gonioloboceras goniolobum Neodimorphoceras texanum Domatoceras obsoletum Poterioceras curtum Metacoceras sp. Euloxoceras greenei Pseudorthoceras knoxense Brachycycloceras normale Conularia crustula Linoproductus cora Juresania nebrascensis Antiquatonia portlockiana Soleniscus primigenius Trepospira illinoisensis Worthenia tabulata Cladochonus sp. On Sunday I made my way to three sites that exposed three different Cretaceous formations. My first stop was a construction site showcasing the Austin Chalk-Eagle Ford Group boundary. It was a lot of fun splitting open large blocks of chalk from the Austin Chalk in search of inoceramids and crawling through shale from the Eagle Ford Group in search of shark teeth. I was excited to find my first ever Ptychodus tooth. Some Austin Chalk inoceramids Ptychodus whipplei Squalicorax falcatus From there I checked out two exposures of the Britton Formation. While I had hopes of finding some of the famed Britton Formation decapods, all that I found was a tail section of the mud lobster Upogebia rhacheochir and a crustacean claw. Most of the concretions will need to be prepped to exposed more of what they have inside before I truly know what I found. I did find a couple of ammonite pieces too. Crustacean claw Ammonite chunks A tiny Sciponoceras gracile My last stop of the trip was a roadside ditch that I had noted on my drive on Friday. The site is mapped as Denton Clay. I did not really know what to expect, so I was pleasantly surprised with what I found. This Pliotoxaster inflatus(?) was my first sign that this site could be productive From there I just kept finding echinoids, and big ones too! At one point I looked down at the ground and there was a line of Macraster sp. just waiting for me to pick them up. I also picked up this Mortoniceras sp. prepped by nature
- 12 replies
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- cretaceous
- pennsylvanian
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From the album: Mark's Mazon Creek Fossils
BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPECIMEN 78mm X 54mm (3-1/16" x 2-1/8"). BOTH ENDS OF CONCAVE HALF GLUED.-
- francis creek shale
- mazon creek
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