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  1. From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY FREEZE/THAW METHOD & LIGHT HAMMER BLOW. SPECIMEN 40mm x 20mm (1-11/16" x 7/8").
  2. Mark Kmiecik

    E0072 Macroneuropteris macrophylla

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY FREEZE/THAW METHOD. SPECIMEN 65mm X 20mm (1-9/16" x 13/16").
  3. Mark Kmiecik

    E0068 Macroneuropteris macrophylla

    From the album: Mark's Mazon Creek Fossils

    CONVEX HALF SIDERITE CONCRETION, SPLIT BY FREEZE/THAW METHOD, CONCAVE HALF CRUMBLED BEYOND REPAIR. SPECIMEN 64mm X 24mm (2-1/2" x 15/16").
  4. From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY FREEZE/THAW METHOD. SPECIMEN 29mm X 20mm(1-1/8" x 13/16"). CONCAVE HALF GLUED.
  5. Mark Kmiecik

    A0019 Septarian

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW, PARTIALLY SHATTERED. SPECIMEN APPROXIMATELY 50mm (2") IN DIAMETER. DISTINGUISHABLE FRAGMENTS GLUED BACK TO ORIGINAL POSITION. EXTENSIVE ACETIC ACID BATH & DENTAL PICK PREP.
  6. connorp

    Unknown Mazon Creek Plant

    I'm stumped on this one. Unfortunately it is not very well defined, but it seems like something interesting... I haven't found anything similar before. Any thoughts are appreciated. @stats @deutscheben @bigred97 @Nimravis @Mark Kmiecik @fiddlehead @flipper559
  7. Mark Kmiecik

    F0002 Essexella asherae

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPECIMEN 35mm X 30mm (1-3/8" x 1-3/16").
  8. Mark Kmiecik

    C0036 ?Crenulopteris acadica

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, FOUND AS IS. SPECIMEN 82mm X 33mm (3-3/16" x 1-5/16"), TAPERING TO 30mm (1-3/16").
  9. From the album: Mark's Mazon Creek Fossils

    THREE PARTS, SIDERITE CONCRETION. TWO SPECIMENS IN DIFFERENT LAYERS. SPLIT BY HAMMER BLOW. CONVEX HALF BROKEN AND GLUED TOGETHER. SPECIMENS 65mm x 10mm (2-9/16" x 3/8") & 5mm X 3mm (3/16" x 1/8"). ALBUMEN APPLIED.
  10. Mark Kmiecik

    B0012 Mazostachys pendulata

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES OF SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPLIT FACE APPROX. 45mm x 45mm (1-3/4" x 1-3/4"). ACETIC ACID BATH.
  11. Mark Kmiecik

    A0014 Lobetelson mclaughlinae

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPLIT FACE 55mm x 47mm (2-3/16" x 1-7/8"). LIGHT ACETIC ACID BATH.
  12. Mark Kmiecik

    E0035 Macroneuropteris scheuchzeri

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY LIGHT HAMMER TAP. SPECIMEN 88mm X 28mm (3-1/2" x 1-1/8").
  13. Mark Kmiecik

    C0107 Macroneuropteris scheuchzeri

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY FREEZE/THAW METHOD & LIGHT HAMMER BLOW. SPECIMEN 80mm X 25mm (3-1/8" x 1"). OVER A PERIOD OF ROUGHLY 15 YEARS THE CONVEX HALF CRACKED AND PART OF THE SPECIMEN'S SURFACE DETACHED. GLUED BACK INTO POSITION - BADLY.
  14. Mark Kmiecik

    C0101 Macroneuropteris scheuchzeri

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPECIMEN 101mm X 30mm (4" x 1-3/16").
  15. Mark Kmiecik

    C0022 Macroneuropteris scheuchzeri

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPECIMEN 80mm X 32mm (3-1/8" x 1-1/4"). CONVEX HALF PARTIALLY DISINTEGRATED DUE TO UNDERLYING LAYER OF PYRITE. SALVAGEABLE PIECES GLUED BACK INTO POSITION.
  16. Mark Kmiecik

    C0021 Macroneuropteris scheuchzeri

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPECIMEN 75mm X 22mm (2-15/16" x 7/8").
  17. Mark Kmiecik

    C0019 Cyperites bicarinatus

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPECIMEN 72mm X 6mm (2-7/8" x 1/4"). FRAGMENT OF CONVEX HALF GLUED INTO POSITION.
  18. Mark Kmiecik

    E0062 Stem or pith cast

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPECIMEN 90mm X 20mm (3-9/16" x 13/16"). BOTH HALVES BROKEN - GLUED.
  19. Mark Kmiecik

    E0046 Crenulopteris acadica?

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPECIMEN 66mm X 23mm (2-5/8" x 7/8"). CONVEX HALF BROKEN - GLUED.
  20. Mark Kmiecik

    C0023 Cyperites bicarinatus

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPECIMEN 110mm X 6mm (4-5/16" x 1/4"). BOTH HALVES FRAGMENTED & GLUED.
  21. Mark Kmiecik

    C0006 Self-destructing pyrite blob

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. HEAVILY PYRITIZED, SPECIMEN 28mm X 26mm (1-1/8" x 1-1/16").
  22. historianmichael

    Pennsylvanian Bivalve from Oklahoma

    Over the last several months I have been using a freeze-thaw method to open up some phosphate nodules I collected from a Middle Pennsylvanian site I visited in Northern Oklahoma. Over the weekend one nodule split open to expose this tiny bivalve. It is only about 9mm in size. I have tried in vain to identify it. Does anyone happen to know what this could be? Any help would be greatly appreciated.
  23. Mark Kmiecik

    E0080 ?Pecopteris sp.

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY FREEZE/THAW METHOD & LIGHT HAMMER BLOW. SPECIMEN 52mm X 20mm (2-1/16" x 13/16").
  24. Mark Kmiecik

    E0038 ?Pecopteris squamosa

    From the album: Mark's Mazon Creek Fossils

    CONCAVE HALF OF FRAGMENT OF SIDERITE CONCRETION, FOUND AS-IS. SPECIMEN, 70mm X 30mm (2-3/4" x 1-3/16").
  25. Mark Kmiecik

    C0041 Macroneuropteris scheuchzeri

    From the album: Mark's Mazon Creek Fossils

    BOTH HALVES SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPECIMEN 64mm X 18mm (2-1/2" X 11/16"). CONCAVE HALF BROKEN ACROSS SPECIMEN - GLUED. ACETIC ACID BATH APPLIED.
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