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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.
The class was created in 1917 by Kidston and Lang for fossils found in the Rhynie Chert Bed. [4] Three genera were initially included, Rhynia, Horneophyton and Psilophyton. All lacked leaves and true roots, consisting only of branched stems; however they were considered to contain vascular tissue. [1] Additional fossil genera were added later.
Florissant Fossil Beds: Florissant Formation: Eocene (Priabonian) North America: US: Colorado: Insects: Fossil Prairie Park: Devonian: North America: US: Iowa: Mazon Creek: Francis Creek Shale: Carboniferous (Pennsylvanian) North America: US: Illinois [Note 1] Ghost Ranch: Triassic: North America: US: New Mexico: Non-Avian Dinosaurs [Note 1 ...
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.
Fossil of the primitive Devonian vascular plant Psilophyton †Psilophyton †Pteria – report made of unidentified related form or using admittedly obsolete nomenclature †Ptychagnostus †Pugnax †Receptaculites †Rhynchonella †Rothpletzella † Sarcinula †Schwagerina †Sinutropis †Skenidioides †Solenopora †Solenopora compacta
Fossil of the Middle Ordovician trilobite Illaenus †Illaenus †Kaulangiophyton †Kaulangiophyton akantha †Kolihadiscus †Kolihadiscus somerseti – type locality for species †Leptaena †Leptaena rhomboidalis †Lesueurilla – tentative report †Lophospira †Lophospira milleri – or unidentified comparable form †Mesoleptostrophia ...
Fossil of the Silurian-Early Devonian eurypterid ("sea scorpion") Acutiramus †Acutiramus †Acutiramus floweri – type locality for species †Acutiramus macrophthalmus †Adelphobolbina †Adelphobolbina medialis – type locality for species †Aechmina †Aechminaria – tentative report †Aesopomum †Aglaeoglypta †Aglaeoglypta koeneni
The formation contains a basal limestone conglomerate overlain by evenly bedded red or gray limestones (more accurately, limy mudstones) and calcareous shales.It is a lenticular, channel-fill deposit which is some 2,500 feet (760 m) wide and 250 feet (76 m) thick at maximum.