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Walcott locates the Burgess Shale beds

Charles Doolittle Walcott, Secretary of the Smithsonian Institution and a palaeontologist of the Cambrian, located the fossiliferous beds on the ridge between Wapta Mountain and Mount Field during fieldwork in the Canadian Rockies. The often-repeated story of a horse stumbling on a fallen slab is probably embroidered, and published accounts differ over whether the productive beds were found in 1909 or traced to their source in 1910. What is not in doubt is what followed: Walcott returned repeatedly, opened what is now called the Walcott Quarry, and shipped tens of thousands of specimens to Washington, where he described them over the following two decades — assigning most of them, on the assumption that the animal groups of the world were already known, to living phyla.

Historical — it happened, and the record is settled.

Subjects

Evidence

Partly verified — Core facts are sourced; some optional detail is deliberately absent. This is the standing of the weakest source, not an average.

Recorded on Burgess Shale, Yoho National Park

  1. Walcott locates the Burgess Shale beds
  2. The Cambridge re-description of the Burgess fauna begins

Related

Related because they share a subject in the Atlas — never because the text looks similar.