2 1 8 Geologica I Society. 



The district of which the transported materials are described 

 is bounded on the west by the transition rocks, extending from the 

 environs of Ludlow to the S.W. of Kington, and on the E. by the 

 Abberley Hills, thus including a large portion of the trough of old 

 red sandstone. It is shown that all the detritus within these limits 

 has been derived from the adjacent rocks. In the neighbourhood 

 of Kington bowlders of the contiguous trap rocks are found upon 

 the talus of the Ludlow rocks, extending to the edge of the old 

 red sandstone, and in the plain W. of Ludlow the surface of the 

 old red is frequently covered with coarse gravel, in which are 

 numerous fragments of the trap rocks of the W. of Shropshire, In 

 general, however, the gravel is chiefly made up of the debris of trans- 

 ition rocks, the coarser varieties being found only near the boun- 

 dary of those formations. Detailed sections are given in the neigh- 

 bourhood of Ledbury ; and the valley of the Teeme is particularly 

 described to prove that, on receding from the transition chains, 

 the gravel becomes more finely comminuted, and exhibits near 

 Tenbury the characters of lacustrine or fluviatile sediments, the 

 materials of which consist exclusively of fragments of the surround- 

 ing rocks of old red sandstone. 



Two remarkable cases of a modern travertin, 5 and 8 miles E. 

 of Tenbury, are then cited, the one near the Spouthouse farm, the 

 other the Southstone Roch, both of which have been accumulated 

 in narrow dells, which intersect transversely promontories of the 

 old red sandstone. At the former the travertin is associated 

 with much sandy marl. The latter is a cavernous rock of about 

 50 feet in height, and has a superficies of more than a quarter of 

 an acre, having on its surface a small house and garden. In both 

 cases the travertin incloses Helices of existing species, and has 

 been occasionally quarried for purposes of building and burning 

 to lime. 



These modern rocks are shown to have been formed by small 

 springs which issue from the calcareous or cornstone strata of 

 old red sandstone, and still encrust the leaves and grasses over 

 which they flow, a process which the author (judging from the 

 size of the rocks produced) supposes to have been in undisturbed 

 action during the whole period of history. 



Although no bowlders of foreign rocks are to be found in the di- 

 stricts above described, it is stated that on the northern confines of 

 the old red sandstone near Bridgenorth and Wenlock, there are many 

 large fragments of granite of various sorts. These are also seen in 

 abundance on the flanks of the Wrekin, but they are not to be 

 traced into the area of the old red sandstone, and as they are 

 entirely different from any of the Welsh rocks, the author refers 

 them to a northern region. In conclusion, it is suggested that the 

 superficial accumulation of the old red sandstone of Salop, Here- 

 fordshire, and Worcestershire may be referred to causes in opera- 

 tion during three epochs, which may hereafter be divided into other 

 distinct periods. 



1. To the currents caused by the elevation of the adjacent 



