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Archimedes is a genus of fenestrate bryozoans with a calcified skeleton of a delicate spiral-shaped mesh that was thickened near the axis into a massive corkscrew-shaped central structure. The most common remains are fragments of the mesh that are detached from the central structure, and these may not be identified other than by association ...
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.
Fossils of the Carboniferous-Permian bryozoan Archimedes †Archimedes †Archimedes confertus †Archimedes intermedius †Archimedes invaginatus †Archimedes lativolvis †Archimedes proutanus †Archimedes terebriformis †Arcochiton †Arcochiton richardsoni †Arizonella – type locality for genus †Arizonella allecta – type locality ...
Fossils of the Carboniferous-Permian bryozoan Archimedes †Archimedes †Archimedes intermedius †Archimedes invaginatus †Archimedes lativolvis †Archimedes proutanus †Archimedes terebriformis †Arizonerpeton – type locality for genus †Athyris †Aulopora †Aviculopecten †Aviculopecten bellatulus – type locality for species
Fossils of the Carboniferous-Permian bryozoan Archimedes †Archimedes †Archimedes communis †Archimedes compactus †Archimedes distans †Archimedes intermedius †Archimedes invaginatus †Archimedes lativolvis †Archimedes macfarlani †Archimedes meekanoides †Archimedes meekanus †Archimedes negligens – or unidentified comparable form
Branches split (or bifurcate) from time to time giving the colonies a fan-shape or, in the genus Archimedes, create an mesh in the shape of an Archimedes screw. [ 1 ] Like all bryozoans, Fenestellids were epifaunal suspension feeders, that occurred between the early Ordovician and the Triassic . [ 2 ]
Fossils of the Carboniferous-Permian bryozoan Archimedes †Archimedes †Archimedes communis †Archimedes compactus †Archimedes confertus †Archimedes distans †Archimedes invaginatus †Archimedes lativolvis †Archimedes macfarlani †Archimedes meekanoides †Archimedes meekanus †Archimedes proutanus †Archimedes sublaxus ...
Fossils of the Carboniferous-Permian bryozoan Archimedes †Archimedes †Arthrorhachis †Athyris †Athyris angelica †Athyris lamellosa †Atlanticocoelia †Atlanticocoelia acutiplicata †Atrypa †Atrypa reticularis †Aulopora †Aviculopecten †Aviculopecten monroensis