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Psilophyton is a genus of extinct vascular plants. Described in 1859, it was one of the first fossil plants to be found which was of Devonian age (about 420 to 360 million years ago ). Specimens have been found in northern Maine , USA; Gaspé Bay , Quebec and New Brunswick , Canada; the Czech Republic ; and Yunnan , China.
Trimerophytopsida (or Trimeropsida) is a class of early vascular plants from the Devonian, informally called trimerophytes.It contains genera such as Psilophyton.This group is probably paraphyletic, and is believed to be the ancestral group from which both the ferns and seed plants evolved.
Index fossils must have a short vertical range, wide geographic distribution and rapid evolutionary trends. Another term, "zone fossil", is used when the fossil has all the characters stated above except wide geographical distribution; thus, they correlate the surrounding rock to a biozone rather than a specific time period.
This list of the Cenozoic life of Alaska contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Alaska and are between 66 million and 10,000 years of age. Acanthocardia; Acirsa; Acmaea; Agonum †Ainus; A living Alces, or moose Alces; Alnus; Alopex †Alopex lagopus; Alvania; Amara ...
The paleontological collections at the University of Helsinki (which houses the Finnish Museum of Natural History) consist of around 20,000 plant and animal fossils. [3] These include Paleozoic invertebrates from the Åland Islands , Cenozoic carnivores, perissodactyls , fossilized microbial remains , and plant fossils , along with remains of ...
The progymnosperms are an extinct group of woody, spore-bearing plants that is presumed to have evolved from the trimerophytes, and eventually gave rise to the spermatophytes, ancestral to both gymnosperms and angiosperms (flowering plants). [1]
Scientists from New Zealand and Senckenberg finally have some answers, thanks to their recent discovery of a fossil belonging to a giant, 150-centimetre long penguin.
"Early Cambrian metazoan fossil record of South China: Generic diversity and radiation patterns". Palaeogeography, Palaeoclimatology, Palaeoecology . 254 (1–2): 229–249.
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