A Morarian age for the ‘younger Moines’ of central and western Scotland
MUCH of our recent knowledge of the Moine metasediments1,2, which extend from the Moine Thrust across the Great Glen Fault to the boundary of the Dalradian Supergroup3,4 (Fig. 1), stems from the western Moine region. Here, late-Precambrian, Morarian ages (740–780 Myr) have been established from pegmatites in the Morar Division5, and a Grenvillian age (1,030 ±50 Myr) from the Granitic Gneiss of Ardgour in the Glenfinnan Division6. The ‘Central Highland Granulites’, generally regarded as ‘younger Moine’2,6, are little known geologically. Here we briefly outline the results of field (by M.A.J.P.) and radiometric investigations (by O.v.B.) in the Central Highland Granulites and the western Moines, which have fundamental implications for the evolution of these extensive metamorphic rocks, and for the nature of the Grenvillian–Caledonian interval in this sector of the North Atlantic Crust.
A complete Lower Dalradian succession in the Schiehallion district, Central Perthshire
Synopsis Remapping of the Schiehallion district of Central Perthshire has led to the recognition of a new succession, stratigraphically interposed between the Moine and the Blair Atholl “Series”. A description of the lithologies and comparison with type areas in the SW Highlands clearly shows that this succession comprises the Ballachulish and Lochaber Subgroups of the Lower Dalradian. The succession, although greatly compressed, is considered to be the most complete sequence of the Lower Dalradian yet described.
Brainstem Influences on the Cephalic Circulation: Experimental Data From Cat and Monkey of Relevance to the Mechanism of Migraine
SYNOPSIS