Desmograptus sp. (fossil dendroid graptolite) (Rochester Shale, Middle Silurian; Middleport Quarry, Middleport, New York State, USA) 1

Desmograptus sp. - dendroid graptolite from the Silurian of New York State, USA.

Graptolites are an extinct group of hemichordates that are most commonly preserved as carbonized compressions on shale bedding planes. They are typically not glamorous fossils, but they are critically important guide fossils and are widely used in biostratigraphy and for international correlation.

The most abundant group of graptolites in the fossil record is the graptoloids. Graptoloid graptolites typically resemble small hacksaw blades. Each “tooth” of the hacksaw blades housed a tentaculate, filter-feeding organism. The entire hacksaw blade is the graptolite skeleton, known as a rhabdosome - a nonmineralized colonial skeleton. Most graptolites were planktonic.

The second most abundant group of graptolites is the dendroids. Most dendroids attached to substrates and had colonial skeletons (rhabdosomes) that are generally broadly branching (conical to fan-shaped to shrub-like to flat spirals). A famous exception is Dictyonema, a planktonic dendroid that had a worldwide distribution. Dictyonema floated freely in shallow and deep oceanic waters.

Other graptolite groups are very rare: the crustoids, tuboids, camaroids, and stolonoids.

Classification: Animalia, Hemichordata, Graptolithina, Dendroidea, Dendrograptidae

Stratigraphy: Rochester Shale, Niagaran Series (= Wenlockian), Middle Silurian

Locality: Middleport Quarry, town of Middleport northwestern New York State, USA
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Info. at:
en.wikipedia.org/wiki/Graptolite

Some rights reserved

Taken on: May 17, 2023

Tags:

Desmograptus

Rochester

Silurian

Middleport

Quarry

New

York

State

grapotlite

graptolites

Dendrograptidae

Dendroidea

dendroid

dendroids

fossil

fossils

carbonization

carbonized

compression

compressions « less

Sets appears in: • Rochester Shale (Middle Silurian; New York State, USA) • New York State Rocks & Fossils more » • Silurian Rocks, Minerals, & Fossils • Graptolite Fossils • Fossil Preservation Styles - Carbonization « less

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