The Quarterly journal of the Geological Society of London . he Boulder-clayhas been let down beside the red sand by a vertical throw, which,calculated from the place of the Boulder-clay on the neighbouring-hills, cannot be less than 40 or 50 feet. No pit of ChillesfordClay now remains open near enough to this to show a satisfactorysection. 640 PEOCEEDINGS OP THE GEOLOGICAL SOCIETY. [Jime]^20, At Wangford tile Crag is at the surface continuously for about afurlong, at the bottom of a hill, and comes out with the red sands overit immediately above some marsh-ground. On the opposite side ofthe va
The Quarterly journal of the Geological Society of London . he Boulder-clayhas been let down beside the red sand by a vertical throw, which,calculated from the place of the Boulder-clay on the neighbouring-hills, cannot be less than 40 or 50 feet. No pit of ChillesfordClay now remains open near enough to this to show a satisfactorysection. 640 PEOCEEDINGS OP THE GEOLOGICAL SOCIETY. [Jime]^20, At Wangford tile Crag is at the surface continuously for about afurlong, at the bottom of a hill, and comes out with the red sands overit immediately above some marsh-ground. On the opposite side ofthe valley, divided from the Crag by this marsh, a Chillesford-Clay-pit occurs, on the top of the hill, distant about half a mile, occupyingprecisely the same position relatively to the Crag-pit as does theChillesford-Clay-pit at Thorpe to the Crag-pit there (see fig. 2).Were it not for the interception of the view by a row of high trees, a Fig. 2.—Section showing the position of the Bulchamp and WangfordCrag-pits relatively to the Chillesford Clay (2 miles).. a. Boulder-clay. b. Chillesford Clay. e. Eed sands between riuviomarine Crag and the Chillesford(d3 and 4 of Diagram).d. Fluviomarine Crag. Clay spectator standing on the edge of the Clay-pit here would look downinto the Crag-pit some 20 to 25 feet below him, in the same manneras is the case at Thorpe. Nothing but an actual vertical section(which would require to be 30 feet at least in height) could, I think,show more clearly the superiority, in these places, of the ChillesfordClay to the Fluviomarine Crag than do these two sections. With re-spect to the passage upwards of both the Fluviomarine and Eed Cragsinto the Chillesford beds, it is only necessary to observe that thereis nothing to indicate any break either physically or the case of the Fluviomarine Crag the interval is represented bya mass of red sand, of which abundant sections occur around Wang-ford and Bulchamp, and which, as I have said, is i
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1845
