• Member description taken from 2007 Long. Tempestite frequency curves: a key to Late Ordovician and Early Silurian subsidence, sea-level change, and orbital forcing in the Anticosti foreland basin, Quebec, Canada. Can. J. Earth Sci. Vol. 44, 413-431. "The Macgilvray member is characterized by massive, nodular to subnodular micrites, planar and wavy laminated micrites, calcarenites, abundant intraformational conglomerates, and minor calcareous mudstones. The member is from 23 to 24 m thick in the composite section measured along the northeast coast and is only slightly thicker along the south-east coast. In the northeast coastal sections, there is a progressive increase in the abundance of bioturbation in the micrites and in the abundance of intraformational conglomerates upsection. Mudstones form 9% to 10% of the succession near the base of the member, decreasing to about 5% higher in the section. Thin sets of planar to wavy laminated micrite are replaced upsection by more massive, nodular to subnodular varieties (BI = 1–3). In places, the micrite beds form parts of shallow channels, up to 30 cm deep and 8 m wide (Fig. 4C). The tops and bases of some micrite and hummocky cross-stratified calcarenite units show marked evidence of erosional sculpturing by both storm currents (in the form of gutters) and biological activity (Figs. 3A, 4B, 5A–5D)."