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Showing results for tags 'Pennsylvanian'.
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From the album: Mark's Mazon Creek Fossils
CONCAVE HALF SIDERITE CONCRETION, FOUND AS-IS. SPECIMEN 102mm X 35mm (4" x 1-3/8"). -
From the album: Mark's Mazon Creek Fossils
BOTH HALVES SIDERITE CONCRETION, SPLIT BY FREEZE/THAW METHOD & LIGHT HAMMER BLOW. SPECIMEN 82mm X 21mm (3-1/4" x 13/16"). -
From the album: Mark's Mazon Creek Fossils
BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. TWO FLORETS (WHORLS), EACH 35mm X 30mm. SPECIMEN 45mm x 35mm (1-13/16" x 1-3/8").-
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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 HAMMER BLOW. SPECIMEN 58mm X 33mm (2-5/16" x 1-5/13"). -
I've found a large number of similar looking, but fragmentary, multicuspid petalodont teeth in the LaSalle Limestone (Late Pennsylvanian) of Illinois. This is one of the more complete specimens I've found. I haven't been able to find a comparable specimen in literature, and was hoping somewhere here might have some thoughts.
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From the album: Mark's Mazon Creek Fossils
BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPECIMEN 10mm x 2.5mm (3/8" x 1/8"). Shrimp and Pecopterid pinna have been suggested as possible IDs. -
From the album: Mark's Mazon Creek Fossils
BOTH HALVES SIDERITE CONCRETION PLUS CAST, SPLIT BY FREEZE-THAW. SPECIMEN 8mm X 4mm X 2.5mm (5/16" x 3/16" x 1/8"). -
From the album: Mark's Mazon Creek Fossils
CONVEX HALF SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. CONCAVE HALF SHATTERED BEYOND REPAIR. SPECIMEN 85mm X 50mm (3-3/8" x 2").-
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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 HAMMER BLOW. SEGMENT OF PINNA. WEATHERED. SPECIMEN 40mm X 25mm (2-3/8" x 1"). -
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. -
From the album: Mark's Mazon Creek Fossils
FOUND AS IS, SPECIMEN 65mm x 60mm (2-9/16" x 2-3/8"). ALBUMEN APPLIED. -
From the album: Mark's Mazon Creek Fossils
FOUND AS IS. SPECIMEN APPROXIMATELY 50mm x 50mm (2" x 2"). -
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. -
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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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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From the album: Llewellyn Formation
Pecopteris Schuylkill County, Pennsylvania-
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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.
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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!
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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.
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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"). -
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"). -
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. -
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").
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