. The Quarterly journal of the Geological Society of London. had no existence, but was part of the plain which slopedgently eastward from Dartmoor across what are now the HaldonHills, and that there was nothing to prevent the Upper Teigiifrom continuing its easterly course; so that it may have joinedor received the Exe (then a much shorter stream) somewhere aboutthe position of Exeter. The country to the north and south of the Teign gorge, betweenSandy Park and Clifford Barton, maintains a high level, rising toover 1100 feet on the south side and to nearly 900 feet on thenorth side : while the
. The Quarterly journal of the Geological Society of London. had no existence, but was part of the plain which slopedgently eastward from Dartmoor across what are now the HaldonHills, and that there was nothing to prevent the Upper Teigiifrom continuing its easterly course; so that it may have joinedor received the Exe (then a much shorter stream) somewhere aboutthe position of Exeter. The country to the north and south of the Teign gorge, betweenSandy Park and Clifford Barton, maintains a high level, rising toover 1100 feet on the south side and to nearly 900 feet on thenorth side : while the highest parts of the country, between Cliiford Vol. 60.] THE VALLEY OF THE TEIGN. 327 Barton and Exeter, do not reach so much as 700 feet (see fig. 2).Consequently, if present altitudes are any guide to the general slopeof the more ancient surface, the ancient Teign could easily have madeits way over the country which now forms the watershed betweenthe*Lower Teign and the Alphin Brook. This I believe to have Fig. 2.—Map of the neighbourhood of [Scale : 1 inch=l mile. Contours indicated in feet. The double broken linesshow the probable course of the ancient rivers.] been its course, until certain chauges took place which led to thecapture of its waters by a tributary of the river that was formingthe valley of the Teign Estuary. The next point that calls for explanation, is the formation ofthe valley now occupied by the Estuary of the Teign. The lengthof this, from near Kingsteignton to Teignmouth, is about 4 miles;and its direction is from west to east, the land on the north side 328 ME. A. J. JUKES-BROWNE OJST [ I904, risiug to over 800 feet, and that on the south side to about500 feet. Mr. H. J. Lowe has suggested1 that this valley is that of astream which formerly ran from east to west and was a tributaryof the Lower Teign, which river he supposed to have then runsouthward into Tor Bay; but he offers no explanation of themanner in which the slope of such a
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1845
