Critical Sections in a Carboniferous Reef Knoll

Abstract

A study of the structure and petrography of the limestones exposed at Hall Hill, in Bowland, enables the geometry of part of a Carboniferous reef knoll to be defined. The main features are a central mound-like core of unbedded, poorly fossiliferous calcite mudstone and a peripheral area of bedded calcite mudstones with original, depositional dips. Thick, well-bedded coarse crinoidal limestones were subsequently bedded over the underlying knoll.

Revision of the Dinantian stratigraphy of the Craven Basin, N England

“…The base of the overlying Bowland Shale Formation was regarded as unconformable by Hudson & Mitchell (1937), but there is no evidence for such a relationship and the lateral variability of the Pendleside Formation is undoubtedly sedimentological rather than erosional. In the NE, the Skelterton Limestone varies from a few m to 30 m (Booker & Hudson, 1926), while the knolls of the North Craven Fault belt may reach 150 m or more (Black, 1953;Ramsbottom, 1974). A feather edge of the typical limestones was described on the SW flank of the Slaidburn anticline by Earp et at.…”

Ultraviolet Properties of Crystalline Anthracene

“…-Ray irradiation of anthracene in air, vacuum, or helium atmospheres produces the same degradation of the emission showing that the change is not due to oxidation. Both intense ultraviolet irradiation and aparticle bombardment reduce the fluorescence output (12). The transfer of excitation in mixed crystals, a field of investigation in which anthracene is used extensively, has been reviewed recently by Birks (8) who also treats the use of anthracene as a scintillator in great detail.…”