36 
The stratigraphic al and areal distribution is reviewed carefully. 
Although it first appears as C. canadensis in Lake Huron region, the genus 
is highly characteristic of post-Trenton and Richmond strata, where it 
undergoes variation and is widespread. Calapoecia is found from Alaska 
eastward to Siberia (excluding the British Isles) and from Kentucky north- 
ward to Washington land in Northwest Greenland. 
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