Description: Specimen: Nice Carboniferous fossil plant preserved in siderite matrix extinct seed fern : Sphenopteris sp. Locality: Poland, GZW Upper Silesia Coal Basin, Stratigraphy: Upper Carboniferous - Westfal B - "Orzeskie" Beds Age: ca. 310 myoMatrix dimensions: ca. 7,0 x 4,0 x 1,0 cm Nice Carboniferous fossil plant preserved in siderite matrix extinct seed fern : Sphenopteris sp. Seed ferns (Pteridosperms) were group of seed plants from the Carboniferous and Permian periods (about 360 to 250 million years ago). Some, such as Medullosa, grew as upright, unbranched woody trunks topped with a crown of large fernlike fronds; others, such as Mariopterids, were woody vines. All had fernlike foliage; however, they reproduced by seeds, with ovules and pollen organs attached to the fronds. Gamete - producing structures in the seeds were surrounded by a hard inner integument and a fleshy outer layer. These features have led some authorities to speculate that these seeds may have been dispersed by animals. Some seeds were large. ( Pachytesta gigantea, a seed of Medullosa, grew up to 7 cm long.) Pollen organs of seed ferns were also large and complex and were commonly made up of many pollen sacs fused into a large structure.
Price: 14 USD
Location: Orzesze
End Time: 2024-12-04T18:39:45.000Z
Shipping Cost: 14 USD
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