The Quarterly journal of the Geological Society of London . Coarse ashy conglomerate At Downhead, on the other hand, it is seen on the slope of thehill, while the fossiliferous tuff occurs a few yards down the slope(see fig. 7, below). Fig. 7.—Section from Tadhill House to Bottlehead Springs,on the scale of 6 inches to the mile. ,. Trap (pyroxenerandesite) Fine tuff withSilurian fossils At many localities there is evidence of its occurrence in rela-tion to the trap. Such a discordant relationship is what would beexpected from the fact that there is no evidence of the presence ofthe upper
The Quarterly journal of the Geological Society of London . Coarse ashy conglomerate At Downhead, on the other hand, it is seen on the slope of thehill, while the fossiliferous tuff occurs a few yards down the slope(see fig. 7, below). Fig. 7.—Section from Tadhill House to Bottlehead Springs,on the scale of 6 inches to the mile. ,. Trap (pyroxenerandesite) Fine tuff withSilurian fossils At many localities there is evidence of its occurrence in rela-tion to the trap. Such a discordant relationship is what would beexpected from the fact that there is no evidence of the presence ofthe upper horizons of the Silurian Series. The possibility of the occurrence of a thrust-plane between the Vol. 6$.~] IXL1ER IN THE ElSTERN MEND1PS. 235 Old Red Sandstone and the Silurian Series must also be borne inmind, especially in view of what has taken place at Ebbor, andperhaps at Yobster and Luckington. In the Kidwelly and Tenbydistrict, too, which in many respects forms a continuation of theMendip area, Mr. E. E. L. Dixon has recently discovered thrustingon a large scale. With regard to the coarse ashy conglomerate, both its nature andits field-relationship are obscure. The following possibilities suggest themselves as to its nature:— (1) That it may be the basement-conglomerate of the Old Red Sandstone. (2) That it may be an a
Size: 2967px × 842px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1840, bookidquarte, booksubjectgeology
