1863.] LIGHTBODY AYMESTRY LIMESTONE. 3G9 



The section in question is in the upper quarry of Aymestry Lime- 

 stone, on the north side of the turnpike-road from Ludlow, and 

 about 1| mile from Leintwardine, on the right-hand side on enter- 

 ing the quarry. The rock has been cut down about thirty feet in 

 a perpendicular face through the Aymestry Limestone, where it 

 yields a few examples of Pentamerus Knightii ; the upper beds con- 

 sisting of what has hitherto been considered to be Upper Ludlow 

 rock, but which I shall presently endeavour to show ought to be 

 classed with the Aymestry Limestone. This upper part is composed 

 of thin beds, chiefly argillaceo-arenaceous, with interposed occa- 

 sional calcareous bands. The argillaceous limestone in the lower two- 

 thirds of the section (1) contains Pentamerus Knightii and Atrypa 

 reticularis, though not abundantly, and exhibits the characteristic 

 lines of honeycomb -structure peculiar to the Aymestry Limestone. 

 In the upper part of this rock may be seen a hollow, some ten or 

 twelve yards in diameter at the top, but rounded at the bottom, and 

 four to five feet deep ; it appears to have been a channel cut through 

 the honeycombed beds by the action of water. This has been 

 again filled in with thin arenaceo- argillaceous beds (3), which are de- 

 posited at the bottom of it, in an inverted arc, quite unconformable 

 to the beds on which they rest, but corresponding to the hollow of 

 the trough. This bent character gradually disappears, until, at some 

 little distance above the edges of the trough, the beds again dip 

 conformably, or nearly so, to the honeycombed beds, and in straight 

 lines, at a moderate angle towards the south-east. These beds are 

 here from three to four yards thick. 



Section in the Aymestry Limestone at Mocktree. 



2 N 



1. Aymestry Limestone. 2. Fault. 3. Starfish-bed. 



There appears to be an oblique fault (2), dipping south, a little to 

 the left of the trough, but which has been covered by the thin beds. 

 These thin beds, which fill the trough, though not quite so hard, 

 correspond very much with the Lower Ludlow beds in the Church- 

 Hill quarry, where the Starfish are so abundant, and contain, to- 

 gether with other fossils, — such as Lingula lata, Ceratiocaris (two 

 species), Pterygotus punctatus, Entomis tuberosa, Calymene Blumen- 

 bachii, and Encrinurus punctatus, — one or two species of Starfish, 

 but only very rarely, and very indifferently preserved. 



