Tyndall Stone is a distinctively mottled and strikingly fossiliferous dolomitic limestone that has been widely used for over century in Canada, especially the Prairie Provinces. It comprises 6–8 m within lower part of 43 thick Selkirk Member Red River Formation, Late Ordovician (Katian) age. quarried exclusively at Garson, Manitoba, 37 km northeast Winnipeg, since about 1895, past half-century ...

Strophomenid brachiopods have long been interpreted as ‘‘snowshoe’’ strategists, with their flattened concavoconvex valves providing resistance to foundering in very soft sediments. There has been a sharp difference of opinion in whether the shells were oriented with their convex or their concave surface in contact with the sediment. This study, along with independent evidence from sedimentolog...

In ichnology, the Goldilocks effect describes a scenario in which a substrate must be 'just right' in order for tracks to form-too soft, the animal will be unable to traverse the area, and too firm, the substrate will not deform. Any given substrate can therefore only preserve a range of tracks from those animals which exert an underfoot pressure at approximately the yield strength of the sedim...