Walcott’s wife, Helena, and three of their four children often accompanied him on his earlier expeditions to the Rockies, where the children joined in the work of splitting rocks in search of fossils. Walcott named one of the Burgess Shale animals Sidneyia, after his son Sidney, who discovered the first specimen in 1910. Helena died in 1911 in a train wreck, and three years later Walcott married Mary Vaux, a talented artist, photographer, and mountaineer. She took an interest in the botany of the Rockies and assisted Walcott in the field.
 

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