A microscope image of a colony of Paraorthograptus kimi, a doomed species of deep-water graptolite.Once common, this species was among those that disappeared during the end-Ordovician mass extinction.

Fossils of graptolites from the Ordovician period. Here you can see a few overlapping tubes, which would have held members of a graptolite colony. Credit: Mark A. Wilson ...

Mitchell has focused much of his work on a group of filter feeders that the extinction hit especially hard: graptolites. These tube-like organisms were plentiful in the Ordovician oceans. “They were ...

The Lower Ordovician (Tremadocian) to the lower part of the Upper Ordovician (Sandbian) is dominated by black shales (or slates) with a continuous graptolite sequence.

The graptolites (described in ref. 2) indicate a Ludlow (Late Silurian) age for the Harpatnar Beds from which they were collected2. Nature - Ordovician Graptolites from the Kashmir Himalayas Skip ...

This facies change, occurring in the early Katian Age of late Ordovician as evidenced by graptolites, indicates the initiation of the Kwangsian Orogeny. Our palaeontological and biostratigraphic ...

Graptolites show us how unpredictable the Silurian period really could be. 11/21/2023 ... with life recovering and flourishing after the mass extinctions at the end of the Ordovician period.

When the world-girdling ice came at the end of the Ordovician period roughly 440 million years ago, only a few species of graptolite survived the mass extinction. Graptolites, whose name means ...

The conodont and graptolite assemblages indicate a mid-Florian, Early Ordovician age, making it slightly younger than the Fezouata Biota from Morocco and the Afon Gam Biota from North Wales.

A new study of nearly 22,000 fossils finds that ancient plankton communities began changing in important ways as much as 400,000 years before massive die-offs ensued during the first of Earth’s five ...