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Found 7 results

  1. hitekmastr

    Trigonocarpus3b.jpg

    From the album: Carboniferous Plant Fossils in My Collection

    This is another view of the same Trigonocarpus, this view showing the open end of the seed. Seeds of seed ferns - this was probably from Medullosa - had open ends to allow pollen to enter. It is thought they were fertilized by pollen when they dropped into the water although a few paleobiologists believe insects may have pollinated them through the opening. Also why were the seeds encased in a fruit like covering (like avocados)? To be consumed by creatures that lived in the shallow swamp water?
  2. hitekmastr

    Trigonocarpus3a.jpg

    From the album: Carboniferous Plant Fossils in My Collection

    This is another large Trigonocarpus from St. Clair, which is contained intact in the shale substrate. The entire seed is visible.
  3. From the album: Carboniferous Plant Fossils in My Collection

    This Trigonocarpus fossil from St. Clair is an exceedingly rare pairing that includes the compression (fossil) and impression (cast) in matching pieces. If you look very closely you can see there is a short stem connecting the seed to the Alethopteris stem. Finding these connected is VERY rare. Also, if you look closely you can see some sort of structure revealed in the very center of the seed.
  4. From the album: Carboniferous Plant Fossils in My Collection

    This 2 inch Trigonocarpus is a seed of a Medullosa (pteridosperms seed plants) which grew in shallow swamps abour 306-308 million years ago when St. Clair, PA was located near the Equator. Leaves associated with this seed & tree include Alethopteris and Neuropteris. It is thought that these seeds were encased in fleshy "fruit" like an avocado. The seeds were open at the pointed end to allow pollen to enter when the seeds dropped into the water in the shallow swamps where these trees grew. These were the largest Carboniferous seeds, growing up to 4 inches.
  5. On our recent half day trip to the St. Clair fern pits (Aug 11), we focused mostly on finding fossil fern seeds. All of these seed fossils came from one half-day visit. The isolated fossils were found on pieces of shale we inspected from the many piles strewn around the excavated collecting pits. Those that show both halves came from fragmenting small to medium sized pieces from the cast-off pieces around the pits. This was a time-consuming exercise in patience and involved a certain amount of luck but as you can see, we accomplished our goal which was to collect some well-articulated seed
  6. hitekmastr

    Walnut Shaped Oddity From St. Clair

    Trigonocarpus (Seed) from St. Clair PA This is a walnut shaped fossil discovered Aug. 30 at the St. Clair, PA Carboniferous fern site. This was found by Nan while she was looking for insects/traces - assume it is a fern seed (trigonocarpus is the morphologic genus given to fern seeds) but we haven't seen this one before. It is about 3 1/2 centimeters long: Here are some closeups:
  7. These fossils are from our second visit to St. Clair (Aug 4) - several are fossils we haven't seen before so we appreciate help with IDs. Special thanks to Fossildude19 for the excellent starting points. Note: some of the images are out of order when you look at the photos below, because I am renaming and reposting them as they are being identified: 1 - Pecopteris Squamosa - This is small and the leaves are very close together and parallel - based on Lesquereux - amazing that some of the best fern identification sources are from 1879! 2 - Calamites Stem Fragment - A thin Calamites branch.
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