Puddlebrook Quarry (grid reference SO646183) is a 0.7-hectare (1.7-acre) geological Site of Special Scientific Interest in Gloucestershire, near Drybrook notified in 1986.

The site is on the northern side of the Forest of Dean and provides a unique exposure of the basal strata of the Westphalian Series of the Upper Carboniferous period.

The conglomerates exposed differ significantly from the sandy beds of the same age of the southern area of the Forest of Dean.

This demonstrates the uplift to the early Westphalian and is important for geological understanding of the development of the Coalfield of the area.

[1] Lower Carboniferous Drybrook Sandstone lies under the conglomerates and there is a significant collection of late Dinantian fossil plants visible (ten different species).