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Found 24 results

  1. I was inspired by @Mark Kmiecik and his quality photographs to finally learn some basic image editing. I had this beautiful Crenulopteris acadica fern open yesterday and figured it would be a good specimen to make a first attempt. Let me know your thoughts.
  2. This weekend I was able to spend a couple hours breaking rock at one of my favorite Pennsylvanian sites. This site exposes the lowest units of the Carbondale Formation, from the top down: Mecca Quarry Shale (MQS), Francis Creek Shale, Colchester No. 2 Coal, paleosol. At various times both the St. Peter Sandstone and Platteville Group (both Ordovician) have been exposed at the bottom of the pits (they were not visible this trip), representing a major unconformity in the area. The concretions from the Francis Creek Shale (i.e. Mazon Creek fossils) are not productive here - my area of focus was instead the MQS. As far as I can tell, the MQS is no longer exposed here. But at the base of the MQS in some locations are large limestone concretions which is what we find here. The limestone is very hard and when freshly exposed does not split easily, so collecting is best limited to limestone which has been weathering for some time. The most abundant fossils in the MQS here are bivalves, but occasionally brachiopods, cephalopods, gastropods, plant material, and fish bits show up. Here are some of my favorite finds. A partial Listracanthus hystrix shark denticle Dunbarella sp. Fish regurgitant (mainly palaeoniscoid bits) Desmoinesia muricatina with an attached spine Pyritized Dunbarella sp. Pseudorthoceras knoxense with several encrusting serpulid worm tubes Just one of many tiny isolated fish bones found Palaeoniscoid scale The base of a Petrodus shark denticle Possibly a bit of cartilage? This is perhaps my most interesting find, although I am not positive on the ID. I believe the spine is a fin spine from an acanthodian, and thus would assume the scales are acanthodian scales? Any thoughts are appreciated. @jdp
  3. connorp

    Pennsylvanian unknown

    I found this fossil last year in the Mecca Quarry Shale (Pennsylvanian) of Illinois. I posted it previously but no definitive answer. I got a new digital microscope recently and decided to snap a few photos of this specimen up close. Hopefully they might help, though I still have no idea what it is. Thoughts?
  4. Reconstruction: References: Bardack, D. & Richardson, E. S.(1977) New agnathous fishes from the Pennsylvanian of Illinois. Fieldiana, Vol. 33, No. 26, publication 1261, pp. 489-510
  5. Still_human

    Edestus teeth

    From the album: Sharks and fish

    The shark relative is genus of eugenodontia holocephalid from the Carboniferous-Pennsylvanian age Anna shale formation, Carbondale group, found in different Illinois coal mines. I dont know(yet)which mine these were found in. This unidentified species is of the "vorax-serratus- crenulatus-heinrichi" or "E. heinrichi group", with the teeth being more of a standard triangular shape, as opposed to being thinner and pointed at a forward angle as in the "E. minor" group http://www.thefossilforum.com/applications/core/interface/file/attachment.php?id=501751
  6. I_gotta_rock

    Calamities Brand and Fern

    From the album: Carbondale, PA

    Carbondale, PA Lewellyn Formation Pennsylvanian period 299-323 myo
  7. I_gotta_rock

    Fern

    From the album: Carbondale, PA

    Carbondale, PA Lewellyn Formation Pennsylvanian period 299-323 myo
  8. I_gotta_rock

    Fern

    From the album: Carbondale, PA

    Carbondale, PA Lewellyn Formation Pennsylvanian period 299-323 myo
  9. I_gotta_rock

    Fern

    From the album: Carbondale, PA

    Carbondale, PA Lewellyn Formation Pennsylvanian period 299-323 myo
  10. I_gotta_rock

    Leaf Impression

    From the album: Carbondale, PA

    Carbondale, PA Lewellyn Formation Pennsylvanian period 299-323 myo
  11. I_gotta_rock

    Leaf Impressions

    From the album: Carbondale, PA

    Carbondale, PA Lewellyn Formation Pennsylvanian period 299-323 myo
  12. I_gotta_rock

    Calamities bark

    From the album: Carbondale, PA

    Calamities sp., a bamboo-like plant closely related to modern horsetails with hollow, woody stem that grew more than 100 ft high (30m). Carbondale, PA Lewellyn Formation Pennsylvanian period 299-323 myo
  13. I_gotta_rock

    Lycopod Bark

    From the album: Carbondale, PA

    Detail from previous image Carbondale, PA Lewellyn Formation Pennsylvanian period 299-323 myo
  14. I_gotta_rock

    Lycopod Bark

    From the album: Carbondale, PA

    Carbondale, PA Lewellyn Formation Pennsylvanian period 299-323 myo
  15. I_gotta_rock

    Unidentified Plant Material

    From the album: Carbondale, PA

    Carbondale, PA Lewellyn Formation Pennsylvanian period 299-323 myo
  16. I_gotta_rock

    Bark

    From the album: Carbondale, PA

    Carbondale, PA Lewellyn Formation Pennsylvanian period 299-323 myo
  17. I_gotta_rock

    Twig or root

    From the album: Carbondale, PA

    Unidentified species of petrified wood Carbondale, PA Lewellyn Formation Pennsylvanian period 299-323 myo
  18. I_gotta_rock

    Leaf Impressions

    From the album: Carbondale, PA

    Pyrite (?) layer over shale Carbondale, PA Lewellyn Formation Pennsylvanian 299-323 myo
  19. I_gotta_rock

    Calamities Bark

    From the album: Carbondale, PA

    Calamities sp., a tree-like plant with hollow, woody stem that grew more than 100 ft high (30m). Carbondale, PA. Lewellyn Formation Pennsylvanian period 299-323 myo
  20. I_gotta_rock

    Lycopod Bark

    From the album: Carbondale, PA

    Carbondale, PA Lewellyn Formation Pennsylvanian period 299-323 myo
  21. I_gotta_rock

    Scale Tree Bark

    From the album: Carbondale, PA

    Syringodendron sp. (Sigillaria family) Carbondale, PA Lewellyn Formation Pennsylvanian period
  22. I_gotta_rock

    Flora Hash Plate

    From the album: Carbondale, PA

    Finely parallel-veined leaves of a Cordaites plant alongside the branch or root of a giant Lycopod (aka scale tree or club moss). The latter could grow up to 50 m high! found in Carbondale, PA Lewellyn Formation Pennsylvanian (Upper Carboniferous) period 299-323 myo
  23. I_gotta_rock

    Scale Tree

    Kathleen B. Pigg of the University of Arizona notes that this "stem subsurface pattern that is sometimes called 'rabbit tracks'. The double track you see is probably a result of a pair of air channels that accompany the leaf trace through the cortex. The vertical ribs are produced by an increase of bark through secondary tissue production." The pair of sepicemns in the first image are the positive and negative impressions of the same piece. The second image is a detail from the same specimen.
  24. I_gotta_rock

    Calamite

    From the album: Carbondale, PA

    Calamities sp., a tree-like plant with hollow, woody stem that grew more than 100 ft high (30m). Found in a tailings pile in Carbondale, PA.
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