Simplify the following text for a Grade 10 native English-speaking person.
Original: This concentrates on the species Wiwaxia corrugata , found in the Burgess Shale , since the other specimens consist only of fragments , while the Burgess Shale has provided at least 138 complete ones .
Simplified: Wiwaxia corrugata is an extinct species of animal known only from fossils found in Canada 's Burgess Shale deposits .