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Found 17 results

  1. Plant Fossil: Alethopteris Ferns?

    Good day, I'm looking at this fossil fern plate from the Llewellyn Formation in St. Clair Pennsylvania. I suspect that these are Alethopteris ferns. I'd like some help to verify their species name. Age: Pennsylvanian Formation: Llewellyn Location: Near St. Clair, Pennsylvania
  2. Alethopteris

    From the album Carboniferous Plant Fossils in My Collection

    © Copyright (c) 2019 by Michael Tomczyk. All rights reserved.

  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 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: Plantae/Plantae Division: Tracheophyta/†Pteridospermatophyta Order: Marattiales/†Medullosales Family: Marattiaceae/ †Alethopteridaceae Genus: Ptychocarpus/†Alethopteris Species: unitas/sp.
  5. 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: Plantae/Plantae Division: Tracheophyta/†Pteridospermatophyta Order: Marattiales/†Medullosales Family: Marattiaceae/ †Alethopteridaceae Genus: Ptychocarpus/†Alethopteris Species: unitas/sp.
  6. 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: Plantae/Plantae Division: Tracheophyta/†Pteridospermatophyta Order: Marattiales/†Medullosales Family: Marattiaceae/ †Alethopteridaceae Genus: Ptychocarpus/†Alethopteris Species: unitas/sp.
  7. 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: Plantae/Plantae Division: Tracheophyta/†Pteridospermatophyta Order: Marattiales/†Medullosales Family: Marattiaceae/ †Alethopteridaceae Genus: Ptychocarpus/†Alethopteris Species: unitas/sp.
  8. Alethopteris

    From the album Cory's Lane Fossil Locality

    Small plate of Alethopteris. Found in 2017 at the Cory's Lane fossil locality, Rhode Island.
  9. Aletheopteris

    From the album Cory's Lane Fossil Locality

    Another small plate of Alethopteris. Found in 2017 at the Cory's Lane fossil locality, Rhode Island.
  10. Pecopteris or other tree fern?

    I received this relatively large fossil about 4 years ago as a Christmas present from a friend. All the information I have about this specimen is that "it comes from the Carboniferous", it was bought from a peddler at the local Christmas market without asking for the provenance. Now I am trying to definitively identify it. I compared it to all my fossil ferns and to many pics online, and some photos of Pecopteris polymorpha are particularly similar in shape. ^This is one of the images I found online. There is a surprising similarity even with the surrounding matrix, could my fossil come from the same formation? My specimen measures about 180 x 140 mm.
  11. Lepidodendron?

    I bought this specimen many years ago in a small museum in Austria. The fossil itself is a very fragile flat piece of coal, was collected locally and sold by the same paleontologist who works in the museum itself. I cleaned it by myself since it was not prepared and covered in soil fragments, the real shape of the fossil had remained hidden behind a black layer of dust. When purchasing, I was told that it probably was a bark fragment from Alethopteris, but looking at it now I have the heavy suspect that it is instead a small Lepidodendron branch (excluding all the surrounding undefined plant material). More detailed information: found on mount Königsstuhl in Nockalm, southern Austria dated 330 million years, Middle Mississippian, Carboniferous measures approximately 21,7 x 14,2 cm This additional photo can be found on my Deviantart page, (am I allowed to post this link here?)
  12. Alethopteris sp.

    From the album Plants

    Alethopteris sp., Carboniferous, Herault, France
  13. Alethopteris sp.

    From the album Plants

    Alethopteris sp. Carboniferous, Herault, France
  14. Dear all, On the website of the Université de Lille 1, you can obtain digital copies of dissertations free of charge. The database also includes older works, including what I think is a fantastic series on Carboniferous plants, named "Houillères du bassin du Nord et du Pas-de-Calais, I. Flore fossile". Below I've added direct links to the five volumes (dissertations) in the series, each dealing with a major group of "fern-like fronds". While some of the works are a bit dated, the plates are marvellous and the descriptions still rather useful. Perhaps some of you could be interested, hence the notification. http://ori.univ-lille1.fr/notice/view/univ-lille1-ori-44098 1e fascicule, Danzé-Corsin (1953) Marioptéridées http://ori.univ-lille1.fr/notice/view/univ-lille1-ori-60409 2e fascicule, Danzé (1956) Sphénoptéridiennes http://ori.univ-lille1.fr/notice/view/univ-lille1-ori-44880 3e fascicule, Dalinval (1960) Pécoptéridées http://ori.univ-lille1.fr/notice/view/univ-lille1-ori-45254 4e fascicule, Buisine (1961) Aléthoptéridées http://ori.univ-lille1.fr/notice/view/univ-lille1-ori-50172 5e fascicule, Laveine (1967) Neuroptéridées Note that the files are considerably large, and may take some time to load... To all likeliness, the Université de Lille 1 dissertation database contains interesting works dealing with other fossil groups as well. Those who are interested could browse the database here: http://ori.univ-lille1.fr/thematic-search.html?menuKey=these&submenuKey=authors&id=indexed_authors Here are a couple other interesting dissertations I ran into: http://ori.univ-lille1.fr/notice/view/univ-lille1-ori-120383 Bertrand (1909) Études sur la fronde des Zygoptéridées http://ori.univ-lille1.fr/notice/view/univ-lille1-ori-38614 Lemoigne (1961) Études analytiques et comparées des structures internes des sigillaires Happy reading/browsing! Cheers, Tim
  15. Fossil seed ferns (Alethopteris sp.). 300 m.y.o. St. Clair, PA. 185mm. One of the coolest fossil hunting experiences I’ve had. The amount of detail preserved in these fossils is incredible—some appear as if the leaves had just fallen! Exploring this area was like being transported back in time. Looking at a fossil like the one pictured here, it is not difficult to imagine the ancient carboniferous swamp coming back to life. For me, fossils are all about stress relief; a sobering—yet comforting—reminder of how briefly we are here, and where our priorities should lie. When I feel overwhelmed, it is relieving to recall how petty our day-to-day struggles are in the grand scheme of things. Life goes on. -Zach
  16. Fossil seed ferns (Alethopteris sp.). 300 m.y.o. St. Clair, PA. 185mm. One of the coolest fossil hunting experiences I’ve had. The amount of detail preserved in these fossils is incredible—some appear as if the leaves had just fallen! Exploring this area was like being transported back in time. Looking at a fossil like the one pictured here, it is not difficult to imagine the ancient carboniferous swamp coming back to life. For me, fossils are all about stress relief; a sobering—yet comforting—reminder of how briefly we are here, and where our priorities should lie. When I feel overwhelmed, it is relieving to recall how petty our day-to-day struggles are in the grand scheme of things. Life goes on. In order to illustrate the detail of these ferns, I found it was critical to get the lighting right. I experimented with many different positions/intensities of flash in order to get the desired effect. If light is coming from directly above, it can easily "flatten" out the fine texture of the piece, and I discovered that angling the flashes to the sides of the piece worked much better. -Zach
  17. Alethopteris in handmade display box

    From the album Pittsburgh Fossils in Handmade Museum Boxes

    This is what I believe to be an alethopteris in shale collected in Rennerdale, PA. About 3 inches across. It is housed in "museum" box I made with two modern fern fronds which were preserved with a special oxidization-inhibiting sealant.
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