Helsby Sandstone Formation
New Red Sandstone Supergroup > Sherwood Sandstone Group > Helsby Sandstone Formation
Age: Triassic > (Anisian Age) 247 – 241 Ma
The Helsby Sandstone (better known in the West Midlands by its former name Bromsgrove Sandstone) is a sedimentary rock mainly deposited by water (fluvatile deposition). Closeup it is formed of often rounded quartz grains coated in iron oxide – the red colour. The rounded grains suggests grains that have been transported by wind – aeolian transport. So we have a rock formed by water deposition of desert wind and water transported sand grains. Helsby (the type locality of this sandstone) is a village in Cheshire.
Beds of soft red fine to medium-grained sandstone deposited by rivers crossing the Triassic desert. From the direction of cross-bedding the overall flow direction is west to east.
Reconstruction of possible environment at the time the Helsby Sandstone was deposited. The view is to the north. The river system had an overall south to north flow direction, with tributaries flowing from west and east.