Abstract
In the year 1888 I published a short paper in the pages of the Geological Magazine and in “Nature,” in which I gave a brief account of the discovery of the fauna of the Olenellus (or Lower Cambrian) zone in the Comley or Hollybush Sandstone of Shropshire. Since that date great advances have been made in our knowledge of the Olenellus fauna of other areas, and the Olenellus zone has now generally attained an established rank and systematic position in the Geological Record as the basal zone of the Cambrian system.

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