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  1. Sauropod19

    Mazon Pit 11

    Hello, it’s been awhile! I’ve been opening up some Mazon Pit 11 stuff and came across this thing. I try to keep myself pretty grounded when it comes to Mazon stuff, because I’m horribly bad at ID’ing anything in a concretion. That said, any chance this is an annelid worm? Thank you as always!
  2. Mochaccino

    Mazon Creek Millipede? Worm?

    Hello, Could I get an ID on this mazon creek unknown? It has pretty high relief and strong segmentation with makes me think arthropod like a millipede, but I don't see any legs so maybe it's an annelid worm or something.
  3. Wrangellian

    Couple of Mazon Creek IDs needed

    This one was sold to me as the acorn worm Mazoglossus ramsdelli... it seems to match photos I see, but I'd like a second opinion, please: This one was sold to me as Archisymplectes rhothon ('ribbon worm') but I'm less confident about this one, so, same question as above. If it's not that, what is it?
  4. I went on a trip to the Braceville spoil pile (Pennsylvanian deposits of Francis Creek shale, similar to other Mazon Creek locations but more marine) with the ESCONI club last week. Some of my concretions have already opened and there are a few things I am not sure about. Most of these might be totally unidentifiable, but just in case wanted to check - any input would be great. 1. I think I see some resemblance to a partial whorl of Spiropteris (curvature, and it seems like there are 1.5 whorls present). Could that be the case or it just some miscellaneous plant bit? 2. This one cracked poorly - is this worm identifiable at all? I don't see any evidence of jaws or segmentation. 3. This one is just weird - possibly a coprolite or a bivalve mold? If so, it would be a quite large bivalve. I don't see a hinge or any evidence of shell texture though. 4. Possibly a messed up Achistrum? 5. The elongated leaf in the middle somewhat looks like a small Cordaites leaf?
  5. I officially got notice that my Belotelsonid and trace fossil cf. Protovirgularia dichotoma were accepted into collections at the Indiana State Museum!
  6. Sauropod19

    Mazon Pit 11 ID

    Hello again. I got the time to scrub off my finds from Friday and found one of interest (and a second that I haphazardly split open that I think is a dud). The top one’s shape remained after several rounds of intense scrubbing, and feels slightly 3D in the middle. Other views of top one: Is there anything in the top one or is it just suggestive mineral staining? Additionally, since there is a crevice present around the entire perimeter, would you recommend I try and pry it open or leave the concretion as is? Lastly, just so I can document the correct number of concretions collected on my permit, which of these four examples (if any) would you consider to be a concretion or half concretion. “a” and “d” are extremely thin, both likely part of the outer “shell” of a concretion. “b” is just an odd shape, and “c” is thick but flat. As always, thank you!
  7. Mark Kmiecik

    J0021 Septarian

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SEPARATED BY FREEZE/THAW METHOD & LIGHT HAMMER BLOW. SPECIMEN 37mm X 30mm (1-7/16" x 1-3/16"). MILD SULFURIC ACID BATH APPLIED.
  8. Mark Kmiecik

    J0018 Neuropteris ovata

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SEPARATED BY FREEZE/THAW METHOD & LIGHT HAMMER BLOW. SPECIMEN 70mm X 25mm (2-3/4" x 1"). FRAGMENT OF EACH HALF GLUED BACK INTO POSITION.
  9. Mark Kmiecik

    E0106 Macroneuropteris macrophylla

    From the album: Mark's Mazon Creek Fossils

    CONVEX HALF SIDERITE CONCRETION, FOUND AS-IS. SPECIMEN 63mm X 21mm (2-7/16" x 13/16").
  10. Mark Kmiecik

    E0073 Macroneuropteris macrophylla?

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY FREEZE/THAW METHOD & LIGHT HAMMER BLOW. SPECIMEN 80mm X 27mm (3-3/16" x 1-1/16"). BOTH HALVES GLUED.
  11. Mark Kmiecik

    E0048 ?Crenulopteris acadica

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPECIMEN 70mm X 30mm (2-3/4" x 1-3/16").
  12. Mark Kmiecik

    J0005 ?Mariopteris nervosa

    From the album: Mark's Mazon Creek Fossils

    FRAGMENT OF CONCAVE HALF OF SIDERITE CONCRETION, FOUND AS-IS. SPECIMEN 50mm X 21mm (2" x 13/16"). MILD SULFURIC ACID BATH APPLIED.
  13. Mark Kmiecik

    A0003 ?Bivalve + burrow?

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES OF SISIDERITE CONCRETION, SPLIT BY HAMMER BLOW. 19mm X 4.5mm (3/4" x 3/16"). ACETIC ACID BATH APPLIED.
  14. Mark Kmiecik

    J0019 ?Pecopteris sp.

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SEPARATED BY FREEZE/THAW METHOD & LIGHT HAMMER BLOW. SPECIMEN 50mm X 18mm (2" x 11/16"). MILD SULFURIC ACID BATH APPLIED.
  15. Mark Kmiecik

    J0015 ?Senftenbergia plumosa forma dentata

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SEPARATED BY FREEZE/THAW METHOD & HAMMER BLOW. PART OF BOTH HALVES CRUMBLED. SPECIMEN 43mm X 28mm (1-11/16" x1-1/16"). NONE. MILD SULFURIC ACID BATH APPLIED.
  16. Mark Kmiecik

    J0013 Unidentified flora

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SEPARATED BY FREEZE/THAW METHOD & LIGHT HAMMER BLOW. SPECIMEN 40mm X 27mm (1-9/16" x 1-1/16"). TWO FRAGMENTS OF RIM OF CONVEX HALF GLUED INTO POSITION. MILD SULFURIC ACID BATH APPLIED.
  17. Mark Kmiecik

    J0006 Unidentified

    From the album: Mark's Mazon Creek Fossils

    CONCAVE HALF OF SIDERITE CONCRETION, FOUND AS-IS. SPECIMEN 24mm X 14mm (15/16" x 9/16").
  18. From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPECIMEN 15mm X 15mm (5/8" x 5/8"). BASAL PINNULE.
  19. Mark Kmiecik

    C0104 Macroneuropteris scheuchzeri

    From the album: Mark's Mazon Creek Fossils

    CONVEX HALF SIDERITE CONCRETION, FOUND AS IS. APPARENTLY HAMMERED AND DISCARDED BY SOMEONE. SPECIMEN 44mm. X 12mm (1-3/4" x 1/2").
  20. Mark Kmiecik

    C0098 Unidentified flora

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPECIMEN 18mm X 9mm (11/16" x 3/8"). CONVEX HALF LOOSE IN MATRIX.
  21. Mark Kmiecik

    C0081 Unidentified

    From the album: Mark's Mazon Creek Fossils

    CONCAVE HALF OF SIDERITE CONCRETION, FOUND AS-IS.SPECIMEN 23mm X 15mm (7/8" x 5/8").
  22. Mark Kmiecik

    C0042 Macroneuropteris macrophylla

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPECIMEN 50mm X 18mm (2" x 11/16"). ACETIC ACID BATH APPLIED.
  23. Mark Kmiecik

    Mazon Creek ID help - 5 more

    Calling on the usual members, again, to either confirm or refute my attempt at ID on these five Mazon Creek specimens. Thanks in advance. @bigred97 @connorp @deutscheben @fiddlehead @flipper559 @Nimravis @Plantguy @RCFossils @Runner64 @stats @TheRocksWillShoutHisGlory Oops, just realized I did not include any size info. These are all close to the same size -- about 1.5 inches (4.25 cm) in the greatest dimension.
  24. Mark Kmiecik

    J0012 Unidentified flora

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SEPARATED BY FREEZE/THAW METHOD & LIGHT HAMMER BLOW. SPECIMEN 40mm X 4mm (1-9/16" x 3/16"). EXHIBITS UNUSUAL STRIATIONS. MILD SULFURIC ACID BATH.
  25. Mark Kmiecik

    J0011 ?Crenulopteris subcrenulata

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SEPARATED BY FREEZE/THAW METHOD & LIGHT HAMMER BLOW. SPECIMEN 18mm X 10mm (11/16" x 3/8"). MILD SULFURIC ACID BATH.
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