Hobbs Quarry

Hobbs Quarry, Longhope

Hobbs Quarry, Longhope

Geological overview
Hobbs Quarry contains a rare exposure of fossilised reefs that formed in a warm, shallow sea during the Silurian period. Today the remains of these coral reefs and the sea creatures that lived over 400 million years ago are preserved as fossils in the limestone

The fossilised reef-like mounds are called bioherms (known to the quarrymen as ‘ballstones’) with their associated sinuous drapes of overlying limestones. These are unbedded, very fine-grained limestones deposited by calcareous algae.

Also found are corals, such as Halysites, Favosites, Heliolites. Stromatopriods are often found in growth position as part of the bioherms.

Longhope, Gloucestershire; Grid Reference: SO 6942 1938


Geological Age
Silurian – Much Wenlock Limestone Formation

Rock Types
Sedimentary – limestone, shale, mudstone

Stratigraphic sequence
Variable lithologies
Sedimentary structures
Nature Reserve (Gloucestershire Wildlife Trust)

Interpretation board on-site
Hobbs Quarry trail leaflet
Huntley, Longhope and Hobb’s Ridge trail guide