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  1. cngodles

    Late Pennsylvanian Fish Tooth

    Whatever this fish tooth is, I've never found one before. I had a small sliver showing in a rock and spent over an hour slowly air scribing over it and getting it to this point. I'm hesitant to go much further, as I may break it. I considered Polyacrodus for the shape, but I see none with the pitted pattern that this has. Tired of trying to ID Pennsylvanian fish teeth yet, @connorp? Maybe this is another paver type teeth from a ray, etc. For scale, the length of the tooth in the first photo is 13 mm.
  2. Lucid_Bot

    I Don't See This In My Field Guide

    I just have so many questions, thanks for your patience. Found these two pieces in what, I think, is Brush Creek Limestone; they're definitely Pennsylvanian Period and from Allegheny County, PA. The first one is 3 cm x 1 cm, the second is about 2.5 cm long.
  3. Lucid_Bot

    Five Holes in an Arch

    Found this the other day in what I think is brush creek limestone. The area is Glenshaw Formation, Carboniferous (Pennsylvanian). All help is appreciated.
  4. Lucid_Bot

    Pennsylvanian Snails and Clams?

    Hello again, I found these tiny specimens today, and I'm not quite sure what they are. If I had to guess, I'd say the spiral shelled creature is Amphiscapha and the more clamish one looks a bit like Kozlowskia without the little side wings. No idea what the last one is. As always, all help is greatly appreciated. Also, sorry about the bad pics, these are quite small specimens.
  5. Last Sunday I took the day to scout some former coal-mined land in western Indiana as well as revisit some sites I hadn’t been to in a few years. The mines at these sites were working the Springfield, Hymera, and Danville coals at various points in the mid-late 20th century. The land has been reclaimed to varying degrees, but I hoped that typical Mazon Creek-like fossil-bearing concretions could still be found, despite almost no information in the literature. Temperatures were a little chilly with the wind blowing as I arrived at the first site. There to greet me was a he
  6. Yesterday I finally made it out to one of my favorite hunting spots after (almost exactly) a year away. This road cut in La Salle County Illinois had been visited earlier this year (I believe) by @Nimravis, @aek and @connorp, but I really wanted a crack at it before summer fully kicked in. As I had been warned, it was already heavily overgrown, with poison ivy located intermittently across the slope. There were also mosquitoes in the shady areas and wasps in the sunny ones. However, with some delicate maneuvering I was able to avoid most of the hazards, with only some mosquito bit
  7. I was lucky enough last week to be able to make my second donation to the collections of the Field Museum of Natural History in Chicago. This donation consisted of two Mazon Creek finds from the river itself, both collected on the I&M Canal outing last year. The first is an extremely rare tetrapod larva. The second fossil is an exceedingly well-preserved Orthacanthus tooth, featuring serrations in the cusp, a very rare trait for Mazon Creek teeth of this sort. It may prove to be complete as well. I was able to visit the museum to make
  8. Mark Kmiecik

    I0003 Unidentified

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPECIMEN 15mm X 3mm (5/8" x 1/8"). CALCIFIED.
  9. Mark Kmiecik

    H0002 Lepidostrobophyllum sp.

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPECIMEN 20mm X 5mm (13/16" X 3/16").
  10. From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPECIMEN 15mm X 13mm (5/8" X 1/2"). BASAL PINNULE.
  11. Mark Kmiecik

    C0097 Myalinella meeki

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPECIMEN(EXPOSED PORTION) 10mm X 3mm (3/8" x 3/16"). SPECIMEN PARTIALLY CONCEALED IN MATRIX.
  12. Mark Kmiecik

    C0096 Annularia inflata

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPECIMEN 20mm X 15mm (13/16" x 9/16").
  13. Lucid_Bot

    Pennsylvanian Marine Fossil?

    Howdy! Chiseled this out of a rock today. I thought it was a coral at first, but not quite sure now. The final picture is a cross section of the inside. Thanks in advance.
  14. Mark Kmiecik

    C0094 ?Pecopteris fontainei

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPECIMEN 25mm X 22mm (1" x 7/8").
  15. Mark Kmiecik

    C0087 Coprolite?

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPECIMEN 9mm X 8mm (3/8" x 5/16").
  16. From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SEPARATED BY FREEZE/THAW METHOD. SPECIMEN 20mm X 11mm (13/16" x 7/16"). BASAL PINNULE.
  17. Mark Kmiecik

    C0045 Alethopteris sp.

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SINGLE PINNULE. SPECIMEN 16mm X 8mm (5/8" x 5/16"). PEANUT OIL APPLIED.
  18. Mark Kmiecik

    C0003 Cyclopteris orbicularis

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPECIMEN 20mm X 12mm (13/16" x 1/2").
  19. Last year @jdp was kind enough to identify the tiny and jumbled skeleton I found in a concretion in eastern Illinois http://www.thefossilforum.com/index.php?/topic/107472-mysterious-jumble-inside-pennsylvanian-concretion/ as a lysorophian tetrapod and direct me to the Field Museum in Chicago as a possible repository for it. This month I finally completed the donation and it has been added to their collection, a fantastic event for someone who has been visiting the museum for more than 30 years to gaze in wonder at their world-class collection. Thank you again to @jdp and The Fossil Forum for m
  20. deutscheben

    My Mazon Creek Finds

    I will be using this thread to post what I have found fossil hunting in the Mazon Creek area, including the ESCONI Braceville pile, Mazonia/Braidwood, and any other sites I get a chance to explore. Although I had been to Mazonia a few times previously with virtually no luck, my first successful trip was with ESCONI last September at the private spoil pile they have access to. These first fossils are all from there. I have tried to give the best IDs I can- please jump in if you think I have anything wrong. I also forgot to put something in for scale on this first batch of photos, my apologies.
  21. Marco90

    Pecopteris villosa

    From the album: My collection in progress

    Pecopteris villosa Brongniart 1822 Location: Mazon Creek, Illinois, USA Age: 323 - 299 Mya (Pennsylvanian, Carboniferous) Measurements: 2x12,5 cm Kingdom: Plantae Division: Polypodiophyta Class: Polypodiopsida Subclass: Marattiidae Order: Marattiales Family: Marattiaceae
  22. Mark Kmiecik

    Mazon Creek ID help

    Calling on the MC regulars again and anyone else who may have a clue. This time I'm not even going to venture a guess. It's up to you guys to ID at least the genus. Thanks again. @bigred97 @connorp @deutscheben @fiddlehead @flipper559 @Nimravis @Plantguy @RCFossils @Runner64 @stats @TheRocksWillShoutHisGlory
  23. Found this near little elk creek in Piedmont, SD at the base of the Black Hills. After some research, Pennsylvanian age shark material has been found there in the past. These are much smoother than some images I have seen online. Thoughts?
  24. Mark Kmiecik

    J0003 ?Crenulopteris acadica

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SEPARATED BY FREEZE/THAW METHOD. SPECIMEN 24mm X 5mm (15/16" x 1/4") MILD SULFURIC ACID BATH APPLIED.
  25. Mark Kmiecik

    J0007 Unidentified

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SEPARATED BY FREEZE/THAW METHOD & LIGHT HAMMER BLOW. SPECIMEN 18mm X 17mm X 7mm (11/16" x 11/16" x5/16") FRAGMENT OF CONCAVE HALF GLUED BACK INTO POSITION.
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