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Lunedale Geology - Images

Lunedale 320 million years ago

Lunedale about 320 Million Years Ago

Reconstruction of the tropical sea floor, about 320 million years ago during the Carboniferous Period, with corals, crinoids, bryozoa and a variety of shells.

This is a photograph of a model, built by Peter Young in 2006, in the Bowless Visitor Centre, Teesdale.

Greengates Quarry

Greengates QuarryThe Five Yard Limestone and associated sandstones and shales exposed in the north wall of the quarry.

The dolerite dyke has been excavated from the deepest part of the quarry, at the foot of the high face.

Closehouse Mine

Closehouse mineThe working face of the opencast pit in 1984 showing the wide barytes vein and folded limestone beds on the left.

Closehouse Mine

Closehouse mineOld underground workings in the wide barytes vein, exposed in the opencast pit in 1990.

Lunehead Mine

Lunehead mineThe headframe and dumps at a small trial shaft in 1974.

Hunter's Vein, Lunehead

Hunter's VeinOld opencast workings on the outcrop of the vein.

Hunter's Vein, Lunehead

Hunter's VeinOutcrop of Hunter’s Vein, here containing witherite and barytocalcite, in limestone wallrock.


BarytocalciteA fine specimen from the workings on Hunter’s Vein.

Characteristic narrow white crystals protrude into cavities

This specimen is about 7 cm across: individual crystals are up to about 2 mm long.


GalenaTypical metallic crystalline galena interbanded with baryte. Closehouse Mine.

The specimen is about 12 cm long.


PyromorphiteDeep green crystals on baryte.

Although a common mineral in lead veins, pyromorphite is rather uncommon in the Northern Pennines. Closehouse Mine was the source of some of the finest examples found in the Pennines.

Individual crystals on this specimen are up to about 3 mm long.


RosasiteSmall turquoise-blue globules on baryte.

One of several good specimens of this rather uncommon Northern Pennine mineral that were collected at Closehouse Mine in the 1980s.

This specimen is about 10 cm across: the blue globules are up to 2 mm across.


AnglesiteSharply pointed crystals from Closehouse Mine.

Although a rather common mineral, good crystals are more unusual. Some very fine examples, such as this one, were obtained at Closehouse in the 1980s.

These crystals, which are up to about 2 mm long, have been photographed under a scanning electron microscope.