Yeolmbridge is a village in Cornwall

Cornwall

Cornwall is a unitary authority and ceremonial county of England, within the United Kingdom. It is bordered to the north and west by the Celtic Sea, to the south by the English Channel, and to the east by the county of Devon, over the River Tamar. Cornwall has a population of , and covers an area of...

, two and a half miles north of Launceston.

Yeolm Bridge over the River Ottery

River Ottery

The River Ottery is a small river in northeast Cornwall, United Kingdom. The river is approximately twenty miles long from its source southeast of Otterham to its confluence with the River Tamar at Nether Bridge, two miles northeast of Launceston.The headwaters of the River Ottery are within the...

 is Grade I listed and a Scheduled Ancient Monument. Built about 1350, it is considered the oldest surviving and best built of medieval Cornish bridges. Nikolaus Pevsner

Nikolaus Pevsner

Sir Nikolaus Bernhard Leon Pevsner, CBE, FBA was a German-born British scholar of history of art and, especially, of history of architecture...

 described it as Cornwall's "most ambitious" bridge.

Yeolmbridge Quarry SSSI is 250 m to the east of the village. The quarry is designated a Site of Special Scientific Interest

Site of Special Scientific Interest

A Site of Special Scientific Interest is a conservation designation denoting a protected area in the United Kingdom. SSSIs are the basic building block of site-based nature conservation legislation and most other legal nature/geological conservation designations in Great Britain are based upon...

 and a Geological Conservation Review (GCR) site, as the type–locality

Type locality (geology)

Type locality , also called type area or type locale, is the where a particular rock type, stratigraphic unit, fossil or mineral species is first identified....

 of the Yeolmbridge Formation; a black shale

Shale

Shale is a fine-grained, clastic sedimentary rock composed of mud that is a mix of flakes of clay minerals and tiny fragments of other minerals, especially quartz and calcite. The ratio of clay to other minerals is variable. Shale is characterized by breaks along thin laminae or parallel layering...

 which shows the Devonian

Devonian

The Devonian is a geologic period and system of the Paleozoic Era spanning from the end of the Silurian Period, about 416.0 ± 2.8 Mya , to the beginning of the Carboniferous Period, about 359.2 ± 2.5 Mya...

–Carboniferous

Carboniferous

The Carboniferous is a geologic period and system that extends from the end of the Devonian Period, about 359.2 ± 2.5 Mya , to the beginning of the Permian Period, about 299.0 ± 0.8 Mya . The name is derived from the Latin word for coal, carbo. Carboniferous means "coal-bearing"...

boundary around 359 million years ago with a sequence of fossils.