| Locality | Layer | |
|---|---|---|
|
|
Great Britain, England,Derbyshire, Crowdecote near Buxton | P1a; B2b |
|
|
Great Britain, England,Derbyshire, Park House Hill | B2 |
|
|
Great Britain, England,Devonshire, Westleigh, near Burlescombe | Lower Visean |
|
|
Great Britain, England,Staffordshire, Gateham Hill | Hopedale limestones,buildup facies |
|
|
USA, Alaska, Brooks Range, Lisbourne Ridge, 2 mls S of, 11818 | black chert in Alapah Lst. |