DB Specific Record

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***SWAAG_ID***	641
Date Entered	12/11/2012
Updated on	13/11/2012
Recorded by	Tim Laurie
Category	Geological Record
Record Type	Geomorphology
Site Access	Public Footpath
Record Date	09/11/2012
Location	Barnard Castle. Deepdale Beck
Civil Parish	Cotherstone
Brit. National Grid	NZ 0310 1638
Altitude	189m
Geology	Very large erratic boulder of Shap Granite on the bed of Deepdale Beck, a south bank tributary of the Tees. This boulder is much the largest in the area but careful search of the stream bed will reveal several other boulders of both Shap Granite and of Borrowdale Volcanics.
Record Name	The Deepdale Shap Erratic, John Phillips and the theory of glaciation.
Record Description	Very large erratic boulder of Shap Granite on the bed of Deepdale Beck, a south bank tributary of the Tees. This boulder is the largest in the area but careful search of the bed of Deepdale Beck will reveal several other boulders of both Shap Granite and of Borrowdale Volcanics. This boulder of Shap Granite was one of the erratics noticed by John Phillips,the pionneering Yorkshire Geologist, who realised that Glacial Ice was the only possible transport of such large boulders and thus contributed to the , then, original and revolutionary idea of Glaciation. For details of John Phillips Life and Works, see .Phillips published his 'Geology of the Mountains, Moorlands and Sea Coast of Yorkshire'.
Additional Notes	The photographs show not only the well known boulder of Shap Granite but other large erratic boulders in the bed of the stream also. Shap erratic boulders mark the extent of the Stainmore Glacier and are found on the Yorkshire Coast as far south as Robin Hoods Bay and also in the Vale of York. No Lake District erratics are present in Swaledale as the Swaledale Glacier was fed from local snow fields. The southern limit of Shap Erratics was considered by Raistrick (Raistrick, A. 1929. 'The glaciation of Wensleydale, Swaledale and adjoining areas.' Proc. Yorshire Geol. Soc.20. 390-410). to be on the line of the south bank of the Greta and Gill Beck. However I have found a number of Shap Granites marking a southern limit of the ice stream carrying Shap Granites some 3km further south: on Barningham Moor, including a single small boulder at an elevation of 430m AOD on Eel Hill at the northern edge of the High Moor, see also SWAAG Record No. Shap and Borrowdale volcanics are widespread in the area of the Stainmore Ice and can be looked for at all exposures of boulder clay. There is a boulder mounted by a public building on North Road, Darlington and a large boulder of Shap granite is perched on the summit of Goldsborough Hill on Ctherstone Moor.
Image 1 ID	3672 Click image to enlarge
Image 1 Description	The Deepodale Shap Granite Boulder
Image 2 ID	3673 Click image to enlarge
Image 2 Description
Image 3 ID	3674 Click image to enlarge
Image 3 Description	A careful look at the surface of the boulder will identify the large pink rectangular chrystals of Felspar characteristic of Shap Granite.
Image 4 ID	3675 Click image to enlarge
Image 4 Description
Image 5 ID	3676 Click image to enlarge
Image 5 Description	A second , smaller boulder of Shap Granite in the stream bed.
Image 6 ID	3677 Click image to enlarge
Image 6 Description	Boulders of Borrowdale Volcanic Rock also.
Image 7 ID	3678 Click image to enlarge
Image 7 Description
Image 8 ID	3679 Click image to enlarge
Image 8 Description
Image 9 ID	3680 Click image to enlarge
Image 9 Description	The Deepdale Boulder photographed during the later 19C. Note that the woodland in this area of Deepdale had been clear felled. Reference; Coggins, D. 1989. 'Teesdale in Old Photographs' Figured on page 15
Image 10 ID	3681 Click image to enlarge
Image 10 Description	The Deepdale Boulder photographed during the later 19C. This was the destination for a popular Sunday Afternoon Walk,School and Museum trips.