Ft. in. 



. 2 



6 



. 1 







say 4 



say 1 



1 ft. to 1 





 6 

 6 



. 1 



4 



. 3 







6 FAUNA OF THE CORNBRASH. 



Further on the downward succession seems to be : 



1. Grey-purplish, fucoid, gritty limestone, with fragments of Macroceplialites and 



Trigonia ..... 



2. Disintegrated purplish soft brash 



3. Hard band, top only seen, with doggers in an interval below. 



4. Weak purplish flaky stone, harder below, with tetragonal Serpulse 



5. Massive limestone, level at the top, cavernous below 



6. Softer flaky brash with large septate nodules 



7. Massive limestone, only upper part seen . 



None of the Avicula echinata brash is yet seen. For this we must go farther 

 west to the " Passage " on the old Ordnance map. After passing some isolated 

 bands we reach some massive irregular limestone full of Avicula echinata with 

 many Pholadomya underlain by brashy, rubbly rock ; this is the base of the 

 Cornbrash, and the Forest Marble follows, thrown out by a spring in clay. 



3. Buckland Ripers to Langton. — The strata in this neighbourhood being 

 thrown into an anticlinal, we see the Cornbrash again on the northern side of it. 

 At first it forms a low crag on the south side of the stream at Buckland Ripers 

 Farm. This consists of imbedded rock with abundance of Avicula echinata 

 and Myacidas corresponding to No. 16 of the Radipole section, with flaggy rock 

 of the Forest Marble type behind, and no doubt dipping beneath it. At the 

 quarry in the farmyard (a) the rubble bed is overlain by 6 — 8 ft. of softer brash, 

 with bands of rubbly clay, the outcrop at the crag being thrown back to the top 

 of the hill slope. To the west, however, beyond Buckland Ripers the Cornbrash 

 outcrop expands, and the Oxford Clay, indicated by its large septaria, succeeds in 

 due course ; accordingly on the slopes leading down to this we find representatives 

 of the higher beds in the Cornbrash. On approaching Langton Herring the outcrop 

 rapidly narrows, and the basal beds are almost confined to the north side of the 

 road. On the south side of the road, at the turning to the Rectory, the basal 

 rubble is seen crossing the flaggy Forest Marble which lies in the same bank. As 

 there are many other exposures of Forest Marble, and all of these are fossiliferous, 

 great care is necessary in quoting fossils from Langton as Cornbrash, unless 

 proved by the nature of the matrix. There is also an exposure in Rodclen Lane, 

 just beyond Langton. A fault passes through a sand-pit at the summit of the 

 hill, and on the north side of this fault is some yellowish brash capped with 

 harder stone containing Cornbrash fossils and dipping rapidly northwards. On 

 the other or west side of the road the same is exposed in temporary excavations, 

 but more resembling that at Buckland Ripers. 



4. Abbotsbuey Wall Down. — This affords the most westerly exposure known 

 in this district, but is rather obscure both at the top and at the bottom, and the 

 low ledges forming a promontory which bounds the swannery are not suitable for 

 accurate measurement. After some flaggy beds and loose doggers with large 



