'Original entry: Hornblende Porphyrite; Similar To S. 20727'
Stratigraphy
Not entered
Comments
S. 20718-20728 are a set of irregular intrusive sheets, either horizontal or inclined to W or N. S. 20721-20722 are members of a composite sheet, S. 20722 being maerginal and margins of two being abrupt;S. 20723 and S., 20724 are similarly related b