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Showing results for tags 'archaeopteris'.
Found 11 results
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From the album: Misha's Late Devonian Fossils
Archaeopteris sp. Early progymnosperm frond and other plant debris Fammenian Catskill Formation Pennsylvania-
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- archaeopteris
- fammenian
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Taxonomy from Fossilworks.org. Synonym: Palaeopteris Schimper 1869. The fossil wood known as Callixylon and the leaves known as Archaeopteris are actually part of the same plant. Diagnosis for Archaeopteris from Anderson et al. 1995, p. 310: “The sterile branching systems bear leaves attached either directly to the penultimate branch or to the ultimate branch. The leaves which flare from a narrow base become flabellate and rounded distally, and vary from nearly entire to deeply dissected (Beck, 1981: 199). The present collection fits more into the dissected end of the range. The fertile -branching systems produced ultimate fertile branches bearing leaves on the adaxial surface of which were borne sporangia and on occasion, basal and/or apical leaves which functioned primarily as photosynthetic organs. The new fertile material also bears sporangia on the adaxial surface of the leaves of the ultimate fertile branches and furthermore a few leaves also occur directly on the branch.” Line drawing of Archaeopteris from Beck 1962, p. 374: References: Beck, CB (1960). "The identity of Archaeopteris and Callixylon". Brittonia. 12 (4): 351–368. doi:10.2307/2805124. Beck, CB (1962). "Reconstructions of Archaeopteris, and further consideration of its phylogenetic position". American Journal of Botany. 49 (4): 373–382. doi:10.1002/j.1537-2197.1962.tb14953.x. hdl:2027.42/141981. JSTOR 2439077. Beck, CB (1981). Archaeopteris and its role in vascular plant evolution. In: Niklas KJ, ed. Paleoebotany, Paleoecology, and Evolution, Vol. 1. New York: Praeger, 193-230. Anderson, H. M., Hiller, N. & Gess, R. W. (1995) Archaeopteris (Progymnospernopsida) from the Devonian of southern Africa. Botanical Journal of the Linnean Society 1995, I I7: 305 320. With 37 figures.
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- archaeopteris
- callixylon
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From the album: Catskill Formation PA fossils
A nice, rare Archaeopteris obtusa from Red Hill, Apr. 15, 2022-
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- archaeopteris
- leaf
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From the album: Catskill Formation PA fossils
Plants from Red Hill, including Archaeopteris, Rhacophyton, and Ozinachsonia-
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- archaeopteris
- otzinachsonia
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Mid-Devonian (Archaeopteris) fossil forest in peril, Cairo, New York
Oxytropidoceras posted a topic in Fossil News
The world's oldest fossilized forest is in Greene County. It needs saving. Roger Hannigan Gilson, Times Union, Aug. 5, 2021 The world’s oldest known fossil forest has been discovered in a quarry in upper New York state By Kelly Murray, CNN, December 20, 2019 The open access paper is: Stein, W.E., Berry, C.M., Morris, J.L., Hernick, L.V., Mannolini, F., Ver Straeten, C., Landing, E., Marshall, J.E., Wellman, C.H., Beerling,D.J. and Leake, J.R., 2020. Mid-Devonian Archaeopteris roots signal revolutionary change in earliest fossil forests. Current biology, 30(3), pp.421-431. open access Yours, Paul H.- 2 replies
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- archaeopteris
- cairo
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Hello, I just uploaded my last short film on the first forests of the Middle Devonian. Automatic English subtitle translation doesn't sound too bad.
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- 3d reconstructions
- archaeopteris
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First trip of the season was to "Red Hill" 5/13 with DVPS
fossilcrazy posted a topic in Fossil Hunting Trips
The Delaware Valley Paleontological Society field trip on Saturday May 13th looked like it was going to be washed out. The weather turned remarkably well. Temps and Humidity were great for pulling down a shale wall. More than 3/4 of the day was trying to start big blocks moving. Much chiseling and prying allowed a tall column to come tumbling down (my foot still hurts). The first picture shows the prying and the layer of Devonian Archaeopteris plants I've been tracing for 3 seasons. The second pictures shows what rolled out. The layer was true to form revealing a beautiful Archaeopteris macilenta frond. This would be my first near whole specimen of this species for me. That is my happy face after some several hours of hard labor. I have a lot of trimming to do and cleaning it up for pictures to submit for IPFOM. Nice start for the 2017 collecting year.
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This last Saturday was a repeat of the previous collecting day I had on Oct. 8 at Red Hill, PA. Once again a tailgate of specimens was found. The most of my digging is in the Green Shale layer. That is where I find the most plants. For the most part, the fossils were all Archaeopteris with one nice macilenta species. A species I don't find much of. The last close up pic is a textbook example of spore cases found on fertile branches of Archaeopteris.
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Some of us fossil collectors believe there is no such thing as a bad day fossil collecting. Well, yesterday at Red Hill, PA it was muddy, rainy and cold. I'll will have to admit it was still a good day fossil collecting. One of my objectives to collecting at this Upper Devonian site is to find fossil plants, namely Archaeopteris. Well it happened big time. A picture of my truck tailgate tells the whole story of my catch of the day. What was found were 3 species of Archaeopteris, fertile and infertile leaves, large plates and small pieces that I liked too much to discard.
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- archaeopteris
- fossil plants
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Site No1 Razdolneview Site views Volcanogenic tuffs There are two type os fossils: compessed prints and petrified wood. Prints Petwood Cell structure of the tissue Site No2 Styla Styla lake Devonian outcrops Palaeovolcano (Maph-Khaya mnt.) Lepidodendropsis prints Look more pictures in my gallery 1 and gallery 2.
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I've been pondering this fossil from St. Clair and it looks like a "cupule" that encloses a seed or spore and I'm thinking that it might be cupules at the end of a node - maybe archaeopteris. Is anyone familiar with these fossil plant cupules who might shed some light on this? One of the very surprising things we're learning about fossil plants (Pennsylvanian) is that many of the ferns and horsetails had different shaped leaves or leaf configurations on the same plant, such as the microphylls on the trunk, cupules that enclosed seeds, and young round leaves versus older elongated leaves (neuropteris for example). Still learning about paleobotany at St. Clair where we've been collecting - fascinating.
