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Found 5 results

  1. SteveE
    From USA, Pennsylvania, Blair County...... Silurian Clinton Group. In profile, this looks conical, with the point down in the sediment rather like a conularid. But viewed from above, it is ROUND.
  2. Dpaul7
    Ptychocarpus unitus, with partial Alethopteris 0.jpg

    From the album: MY FOSSIL Collection - Dpaul7

    Ptychocarpus unitus, with partial Alethopteris Upper Sharp Mountain Mbr-Pottsville Formation of Pennsylvania Pennsylvanian Period (323.2 million years ago to 298.9 million years ago) This Ptychocarpus unitus measures 2" long and is on a matrix measuring 1 3/4" by 3 1/4". There's a nice partial Alethopteris on the reverse side. Alethopteris is a prehistoric plant genus of fossil Pteridospermatophyta (seed ferns) that existed in the Carboniferous period (around 360 to 300 million years ago). It is in the family Alethopteridaceae. Kingdom:
  3. Dpaul7
    Ptychocarpus unitus, with partial Alethopteris 0.jpg

    From the album: MY FOSSIL Collection - Dpaul7

    Ptychocarpus unitus, with partial Alethopteris Upper Sharp Mountain Mbr-Pottsville Formation of Pennsylvania Pennsylvanian Period (323.2 million years ago to 298.9 million years ago) This Ptychocarpus unitus measures 2" long and is on a matrix measuring 1 3/4" by 3 1/4". There's a nice partial Alethopteris on the reverse side. Alethopteris is a prehistoric plant genus of fossil Pteridospermatophyta (seed ferns) that existed in the Carboniferous period (around 360 to 300 million years ago). It is in the family Alethopteridaceae. Kingdom:
  4. Dpaul7
    Ptychocarpus unitus, with partial Alethopteris 0.jpg

    From the album: MY FOSSIL Collection - Dpaul7

    Ptychocarpus unitus, with partial Alethopteris Upper Sharp Mountain Mbr-Pottsville Formation of Pennsylvania Pennsylvanian Period (323.2 million years ago to 298.9 million years ago) This Ptychocarpus unitus measures 2" long and is on a matrix measuring 1 3/4" by 3 1/4". There's a nice partial Alethopteris on the reverse side. Alethopteris is a prehistoric plant genus of fossil Pteridospermatophyta (seed ferns) that existed in the Carboniferous period (around 360 to 300 million years ago). It is in the family Alethopteridaceae. Kingdom:
  5. Dpaul7
    Ptychocarpus unitus, with partial Alethopteris 0.jpg

    From the album: MY FOSSIL Collection - Dpaul7

    Ptychocarpus unitus, with partial Alethopteris Upper Sharp Mountain Mbr-Pottsville Formation of Pennsylvania Pennsylvanian Period (323.2 million years ago to 298.9 million years ago) This Ptychocarpus unitus measures 2" long and is on a matrix measuring 1 3/4" by 3 1/4". There's a nice partial Alethopteris on the reverse side. Alethopteris is a prehistoric plant genus of fossil Pteridospermatophyta (seed ferns) that existed in the Carboniferous period (around 360 to 300 million years ago). It is in the family Alethopteridaceae. Kingdom:
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