The Burgess Shale - Fossil Ecosystems of North America: A Guide to the Sites and their Extraordinary Biotas - page 34

29 30

29 Walcotts Burgess Shale Quarry at 2,300 m
7,500 ft in Yoho National Park, Canada;
Mount Wapta can be seen in the background.

30 Detail of laminated shale in the Burgess
Shale Quarry, showing fining-upwards
sequence with coarse, orange layers at the base
and finer, grey layers above. Measurements
indicate centimetres below Walcotts
Phyllopod Bed.

31

SW NE

Eldon Formation

Burgess
Shale
Formation
(thick)

Escarpment

Stephen
Formation
(thin)

Walcott
Quarry

Reef flat
beds

Cathedral
Formation
(thin-bedded
deep-water
limestone)

Reef
Core

Debris flows

Cathedral
Formation

31 Diagram to show the stratigraphy and structure of the Middle Cambrian succession on
Mount Field after Briggs et al., 1994, Fletcher and Collins, 1998.