330 Mr. Weaver's Geological Observations on 



are often very obscure^ being implicated with each other in the substance of 

 the rock. 



In many parts of this district also, may be observed numerous straight and 

 curvilinear protuberances, disposed either singly, or in an interlaced manner, 

 on the separating surfaces of the beds of sandstone and slate clay. They are 

 indistinct, but seem partly referable to coralloid remains, 



§ 10. At Pyrton, on the Severn, the relations of the rocks are disclosed by 

 the operations of the tide. To the south of the Passage-house, the transition 

 beds, among which are some partly composed of magnesian limestone, appear 

 on the strand for a short distance, thinly interstratified with each other, and 

 disposed in a gently arched form, the strata dipping beyond the crown of the 

 arch 20° to the north-east and south-west. In the former direction, they 

 underlie the lias limestone formation, and their actual contact may be seen at 

 low water, at the landing place immediately under the Passage-house; the 

 lias preserving a conformable dip, and extending thence up the river. In the 

 south-west direction, diluvium and alluvial soil occupy the coast for some 

 distance, beyond which the old red sandstone, to which we shall return in a 

 future part of this paper, appears in a conformable position. 



The transition beds re-appear to the east of Pyrton, and again at Wans- 

 well, and on the right bank of the Avon, extending toward Stone through 

 Oakley farm to Ponting's quarry, the sandstone generally predominating. 

 At the last-mentioned place the beds dip 32° to the west, 18" south ; but on the 

 banks of the Avon at Stone they dip 20° toward the west ; and the same west- 

 erly inclination is observable throughout the eminence which supports that 

 village ; beyond which, near the Eastwood stream, the sandstone reposes on 

 the transition beds in an unconformable position, dipping towards the east. . 



In the transition tract on the right bank of the Avon, opposite to Stone, trap 

 makes its appearance in two old quarries, situated on the north and south of 

 the Gloucester road ; but the fallen state of these quarries prevents further 

 observation. 



§ 11. In a country deeply clothed with soil, it is generally by a combina- 

 tion of detached observations alone that we can arrive at a just conclusion. 

 Hence I have been careful in noting the relative position of all the transition 

 rocks, wherever they have been exposed by natural or artificial causes, 

 whether consisting of trap or stratified beds. Of the latter, sandstone gene- 

 rally prevails on the right bank of the Avon. At Woodford-green, and the 

 two by-roads leading to the Middle Mill, the stratified beds dip generally 15° 

 to 25° toward the west : they flank the Woodford trap, forming on the 

 westernside an intermediate body, by which the Woodford trap is separated 



