. The Quarterly journal of the Geological Society of London. pond was made in 1904, surface-soil to adepth of 12 or 14 feet was penetrated. A careful searchin the neighbouring fields, though yielding much lava, didnot provide any tuff. These observations, though unfortu-nately not confirming- Prof. Lloyd Morgans record of tuff,in no way invalidate it. The spot where he observed thetuff is exactly on the line where one would expect it tooccur: namely, between the limestone and the basalt. Itsnon-occurrence as surface-debris, and the great thickness ofsoil overlying it, are clearly due to its so
. The Quarterly journal of the Geological Society of London. pond was made in 1904, surface-soil to adepth of 12 or 14 feet was penetrated. A careful searchin the neighbouring fields, though yielding much lava, didnot provide any tuff. These observations, though unfortu-nately not confirming- Prof. Lloyd Morgans record of tuff,in no way invalidate it. The spot where he observed thetuff is exactly on the line where one would expect it tooccur: namely, between the limestone and the basalt. Itsnon-occurrence as surface-debris, and the great thickness ofsoil overlying it, are clearly due to its softness. The netresult of the observations made by various geologists onMilton Hill shows that the lava has an outcrop about200 yards wide, which, with a dip of 23° or thereabouts,would imply a thickness of about 150 feet, and that itforms the whole of the strip of well-cultivated groundbetween Furze Close and the road leading from Milton Hillto Kew Stoke. 1 Not only is the lava unexposed, but (despite careful search) I have beenunable to find any 1 part 1] IGNEOUS KOCKS OF THE BRISTOL DISTRICT. 33 All attempts, either to trace the lava eastwards from SpringCove through the woods of Worlebury Hill, or, with the exceptionof that at Florence Cottage, to find any exposures east of thecross-roads at Milton Hill, have been unsuccessful. (e) Middle Hope or Woodspring. There are four exposures of the igneous series in this section. First or western exposure.—Previous descriptions of thelava have alluded to it as a band 12 or 14 feet thick, and this isthe case at the seaward end of the section. If, however, the wholelength of the section, some 50 feet along the strike of the rocks, isexamined, it will be seen that the lava forms a most irregular anddiscontinuous band, as shown in the sketch (fig. 7, p. 32). Thecalcite-amygdules, 4 inches long, mentioned by Sir Archibald Geikieand Dr. Strahan, are near the top of the exposure at its western of tuff in places strike
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Keywords: ., bookcentury1800, bookdecade1840, bookidquarte, booksubjectgeology
