Lulsgate Quarry: A Geological Site of Special Scientific Interest
Located near the village of Felton in North Somerset, Lulsgate Quarry serves as a vital window into the Earth's ancient history. Designated as a Site of Special Scientific Interest (SSSI), this location is prized by geologists for its rare and clear exposure of rock layers that tell a story of vast time gaps and shifting environments.
Key Facts
- Location: Near Felton, North Somerset, England.
- Designation: Site of Special Scientific Interest (SSSI) since 1997.
- Total Area: 1.13 hectares (approximately 2.8 acres).
- Primary Interest: Geological significance.
- Grid Reference: ST516659.
The Geological Significance of Lulsgate Quarry
The primary scientific value of Lulsgate Quarry lies in its unconformity. In geology, an unconformity is a surface that represents a gap in the geological record, where rock layers are missing due to erosion or a period where no sediment was deposited. At this site, the unconformity surface is irregular, providing a distinct boundary between two very different eras of Earth's history.
Below this boundary, the site features inclined Lower Carboniferous (Dinantian) Black Rock limestones. These are older, tilted layers of rock formed during the Carboniferous period. Above this surface lie the Upper Triassic (Rhaetian) strata, which are characterized by flat-bedded layers, indicating a different depositional environment millions of years later.
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Site Specifications and Location
Lulsgate Quarry is a relatively compact site, covering 1.13 hectares. Its precise location is marked by the coordinates 51°23′24″N 2°41′49″W. The site was officially notified as an SSSI in 1997 to ensure the protection of its unique geological exposures for scientific study.
| Feature | Detail |
|---|---|
| Location | North Somerset, near Felton |
| Area | 1.13 hectares (2.8 acres) |
| Notification Year | 1997 |
| Lower Strata | Lower Carboniferous (Dinantian) Black Rock limestones |
| Upper Strata | Upper Triassic (Rhaetian) strata |
| Grid Reference | ST516659 |
Frequently Asked Questions
What makes Lulsgate Quarry scientifically important?
The quarry is important because it provides an excellent exposure of an irregular unconformity surface, allowing scientists to study the contact point between Lower Carboniferous and Upper Triassic rock layers.
Where exactly is Lulsgate Quarry located?
It is located near the village of Felton in North Somerset, England, at grid reference ST516659.
What types of rock are found at the site?
The site contains inclined Black Rock limestones from the Lower Carboniferous (Dinantian) period and flat-bedded strata from the Upper Triassic (Rhaetian) period.
When was the site designated as an SSSI?
Lulsgate Quarry was officially notified as a Site of Special Scientific Interest in 1997.
How large is the protected area?
The site covers an area of 1.13 hectares, which is approximately 2.8 acres.