Fossiliferous horizons in the "Sillery formation" near Levis, Quebec

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Abstract
New fossiliferous localities were discovered in the vicinity of Levis, Quebec, in rocks that have hitherto been assigned to the "Sillery formation." A 1700-ft.-thick section of strata in clearly recognizable order is described. At the base of this section is a shale with thin layers of limestone, containing Lower Cambrian trilobites; this horizon is designated as the Austinvillia zone. Somewhat higher in the section is a limestone conglomerate, whose boulders also yield Lower Cambrian fossils. Near the top of the section, thin limestone beds in the shale yield a few fossils that appear to be of Canadian age; this horizon is designated as the Ellsaspis zone. The conclusion of this work is that the "Sillery," even within the limited area investigated, includes strata that are similar lithologically, but on paleontologic evidence prove to belong to widely different ages. Hence these rocks will have to be subdivided into several formations when their stratigraphy is better understood. The following trilobites are described or recorded: PAGETIDES elegans (genotype, order Eodiscidea, Lower Cambrian). P. minutus (Lower Cambrian), P. leiopygus (Lower Cambrian), P. pustulosus (Lower Cambrian), P. amplifrons (Lower Cambrian), Pagetia ellsi (order Eodiscidea, Lower Cambrian), P. billingsi (Lower Cambrian), Bonnia sp. (order undetd., Lower Cambrian), Austinvillia bicensis Resser (order undetd., Lower Cambrian), Periomma punctata (order undetd., Lower Cambrian), and ELLSASPIS elliptica (genotype, order undetd., Lower Ordovician?). The systematic position of the eodiscid trilobites is discussed.

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