Sweltor and Foggintor Quarries

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Devon County Geological Site Site reference no. PSX927663 Name: Petit Tor - Maidencombe (a) District: Torbay Parish: National grid ref: SX927663 OS sheets: 1:50k 1:25k 1:10k SX927663 GS 1:50k GridRef x y Lat Long SX927663 292700 66300 50.486656 -3.5138692 Locality description (address): Petit Tor Quarry and adjacent coastal exposure. Nature of site: Proposed RIG Site: Quarry & Coastal. Geological / geomorphological features: The site includes the disused Petit Tor Quarry and adjacent coastal exposures dominated by pale stromatoporoid-rich limestones of the Walls Hill Member of the Torquay Limestone Formation (Givetian), overlain to the north by reddish shales of the Saltern Cove Formation (Frasnian). The limestones also yield a scattered fauna of rugose and tabulate corals and a middle varcus Biozone conodont fauna, have solution cavities in their upper surface which occasionally contain pale-pink flinty or slaty limestones or slates. The latter have been interpreted as an Upper Devonian infill and have been reported to have formerly yielded orthocone cephalopods. The overlying mudstones of the Saltern Cove Formation show deformation but apparently include a basal red nodular limestone level with Frasnian conodonts and very rare ammonoids; they are, in turn overlain, unconformably, by a limestone breccia at the base of the Watcombe Formation, the Petit Tor Member. Reasons for registration as a County Geological Site: The Petit Tor area shows the final stages of evolution of the Middle Devonian “Torquay High”, with the apparent development of palaeo-karstic surfaces at the top of the Torquay Limestone Formation infilled with Frasnian sediments. Stratigraphic evidence also supports an intra-Devonian non-sequence, with the Barton Member being absent and the Saltern Cove Formation apparently resting directly on the Walls Hill Member of the Torquay Limestone Formation. The area is of potential educational value. Site sensitivity: Safety: Accessible. Interest groups: Schools. Years 5-11: Years 12-16: Years 17-18. University. Undergraduate - Research Professional geologists - Amateur geologists - General public. Access and Parking: Date of assessment (V = visited) : V Site owner : References: .

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Thrust Tectonics of S Devon
J. geol. Soc. London, Vol. 140, 1983, pp. 215-228, 11 figs, 1 table. Printed in Northern Ireland. Thrust tectonics of S Devon M. P. Coward & K. R. McClay SUMMARY: The tectonics of the area from Start Point to Chudleigh, SW England, are shown to be dominated by northward-verging thrust nappes. Two major thrusts are postulated. The 'Dartmouth antiform' is consideredto be a major thrust structure, nota fold structureas previously interpreted. The Torquay limestones are allochthonous and part of a klippe of a major thrust nappe with a minimum displacement of13 km northwards. A progressive and diachronous sequence of deformation has been established with deformation starting in the S and moving N. Many of the folds and cleavages are probably related to the strains developed locally in thrust tips and may have no regionalcorrelation. More intense and complex deformation is found in the S compared to the N. The diachroneity is also reflected in the K-Ar mineralages. In the S, at Start Point, southward-verging backfolding is the last significant Hercynian deformation phase folding the thrust nappes. In SW England, Hercynian orogenesis has affected the Devon we found thatthe structuralinterpretations Lower to Upper Palaeozoic rocks of Devon and Corn- indicated in previous publications and maps (e.g. wall. Much of this deformation post-dated the deposi- Lloyd 1933) were oversimplified. Further research has tion of Mid-Carboniferous Culm sediments but pre- revealed the presence of largerecumbent folds and dated the intrusion of the SW England granite bath- thrusts; it is the aim of this paperto describe the olith, which has yielded K-Ar mineral ages ranging evidence for these and discuss their significance in from 254 to 277 Ma (Dodson & Rex 1971).
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