Sirius Passet
Coordinates: 82°47.6′N 42°13.7′W / 82.7933°N 42.2283°W
Sirius Passet is a Cambrian Lagerstätte in Greenland. The Sirius Passet Lagerstätte was named after the Sirius sledge patrol that operates in North Greenland. It comprises six places on the east shore of J.P. Koch Fjord in the far north of Greenland. It was discovered in 1984 by A. Higgins of the Geological Survey of Greenland. A preliminary account was published by Simon Conway Morris and others in 1987, but since then, expeditions led by J. S. Peel and Simon Conway Morris have returned to the site several times between 1989 and the present. A field collection of perhaps 10,000 fossil specimens has been amassed.
The fauna is inevitably compared to that of the Burgess Shale, although it is probably ten to fifteen million years older – 518 million years ago vs. 508 million years ago (Martin et al. 2[000; Nevadella zone, stage 3 of Cambrian Series 2) – and more closely contemporaneous with the fauna of the Maotianshan shales from Chengjiang, which are dated to 520 million years ago. Moreover, its preservation is not of typical Burgess Shale type, but rather represents silicification associated with a 'death mask' microbial mat, recalling the 'Ediacara-type' preservation of the Precambrian Ediacara biota.
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