Drawing from Moore, Lalicker and Fischer, Invertebrate Fossils, McGraw-Hill Book Company Inc, 1952, p.291
| Furongian Epoch | ||
| Palaeozoic: Cambrian Period |
Paiban Age |
| Guzhangian | Middle Cambrian | Furongian | ||
| Cambrian Stage IX | Early Ordovician | Timescale |
| Cambrian |
Also known as the Maentwrogian, Dresbachian and the Ffestiniogian, the Paiban is a stage of the Furongian, underlain by the Guzhangian and overlain by an unnamed Stage IX and the Dolgellian, and dated at 501 to about 496 million years ago.
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Drawing from Moore, Lalicker and Fischer, Invertebrate Fossils, McGraw-Hill Book Company Inc, 1952, p.291 |
Hypseloconus elongatus
shell about 2.5 to 4 cm tall
Dresbachian
Wisconsin USA
the Hypseloconoidea, represented by species like Hypseloconus elongatus and Knightoconus antarcticusse, with cap-shaped shells (which in the case of Knightoconus also possessed septa), are often thought to be ancestral to the Cephalopoda, although the evidence for this is still debated
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Drawing © Inga B. Agnér |
Agnostus pisiformis
body about 5 mm long
Early Paiban Age - Agnostus pisiformis zone
Sweden
Agnostid trilobites had only two thoracic segments. These tiny trilobites were planktonic drifters. Following the discovery of a Furongian form from the Orsten Lagerstätten with a limb preserved, it is believed now that these animals were not true trilobites at all, but more closely related to Crustacea
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Drawing from Moore, Lalicker and Fischer, Invertebrate Fossils, McGraw-Hill Book Company Inc, 1952, p.503 |
Tricrepicephalus cedarensis
Phylum : Arthropoda
Class: Trilobita
Order: Ptychopariida
Suborder: Ptychopariina
Superfamily: Crepicephalacea
Family: Tricrepicephalidae
body about 4.5 cm wide
Nolichucky Shale (Early Paiban Age - Agnostus pisiformis (European) zone / Cedaria and Crepicephalus (North American) Zones
Alabama, USA
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Drawing from Moore, Lalicker and Fischer, Invertebrate Fossils, McGraw-Hill Book Company Inc, 1952, p.503 |
Olenus gibbosus
Phylum : Arthropoda
Class: Trilobita
Order: Ptychopariida
Suborder: Ptychopariina
Superfamily: Olenacea
Family: Olenidae
Subfamily: Oleninae
body about 1.5 to 2 cm long
Olenus zone (Late Paiban Age)
Sweden
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Drawing from Moore, Lalicker and Fischer, Invertebrate Fossils, McGraw-Hill Book Company Inc, 1952, p.500 |
Elvinia roemeri
Phylum : Arthropoda
Class: Trilobita
Order: Ptychopariida
Suborder: Ptychopariina
Superfamily: Komaspidacea
Family: Elviniidae
body about 1.5 to 2 cm long
Wilberns Formation , Elvinia (North American) Zone Olenus/Agnostus obesus zone (Late Paiban Age)
Texas
cranidium and pygidium "tail"