Premium
The Nod Glas sediments of Caradoc age in north Wales
Author(s) -
Cave R.
Publication year - 1965
Publication title -
geological journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.721
H-Index - 54
eISSN - 1099-1034
pISSN - 0072-1050
DOI - 10.1002/gj.3350040204
Subject(s) - geology , facies , horizon , oil shale , fauna , paleontology , nod , geochemistry , biology , ecology , physics , structural basin , astronomy , endocrinology , diabetes mellitus
Twenty feet to thirty feet of black shale, phosphorite and limestone exposed near Welshpool, Montgomeryshire, exhibit a facies which enables a correlation to be made between the Welsh graptolitic Nod Glas shales of Caradoc age and the shelly Onnia Beds of south Shropshire. Graptolitic evidence suggests that the visible thickness of the Nod Glas near Welshpool belongs to the top of the Dicranograptus clingani zone, and the shelly fauna indicates the zone of Onnia gracilis . At the base of the Nod Glas throughout Montgomeryshire is a phosphatic horizon of variable development.