Sandbian


The Sandbian is the first stage of the Upper Ordovician. It follows the Darriwilian and is succeeded by the Katian. Its lower boundary is defined as the first appearance datum of the graptolite species Nemagraptus gracilis around million years ago. The Sandbian lasted for about 5.4 million years until the beginning of the Katian around million years ago.

Naming

The name Sandbian is derived from the village Södra Sandby. The name was proposed in 2006.

GSSP

The GSSP of the Sandbian is the Fågelsång section at Sularp Brook, east of Lund. It is an outcrop of shale and mudstone. The lower boundary of the Sandbian is defined as the first appearance datum of graptolite species Nemagraptus gracilis in that section.

Palaeontology

Agnathans

Molluscs

Cephalopods

Endocerids