476 PROCEEDINGS OF THE GEOLOGICAL SOCIET\, 



form a very reduced equivalent of the more enlarged and perfect 

 system in Dorsetshire. It is extremely difficult to get good conse- 

 cutive sections in Wiltshire, and allowance must be made for faults 

 and denudation ; but the following section, in descending order, taken 

 at different points, makes the order of succession clear and definite. 

 It was drawn up by my friend the Rev. O. Fisher, and with his 

 permission I subjoin it here, as it tallies in most respects with a 

 section which I had made in the same direction, and gives one or 

 two beds which I did not detect. 



Adjoining Quarries on the south side of the River Nadder, near 

 Teffont Mill. 



MIDDLE PURBECKS. ft. in. 



1. Brownish-yellow clay 



2. Indurated sand, in layers 2 



3. Whitish sandstone 6 



4. Brown earth, with comminuted shells 1 



5. " Beef " (fibrous carbonate of Ume) 2 



6. Layer of oysters 6 



7. White earthy limestone, with many Archeeonisci (A. Brodiei) and 



Corbul(B 6 



8. Hard blue limestone*, splitting into laminEe 2 



9. Thinly laminated white marly limestone and clay (" biscuit "), con- 



taining ^rcAffiowiscMS and Fucoids 6 



10. White sandstone 0^ 



11. Reddish-brown coarse laminated sandstone, with 0«^rea and Cyrena 5 



(The contrast of colour here is remarkable.) 



12. Thin-bedded, white, soft limestone 1 8 



13. Shale, with Cypris fascicuMa, s.uAY\sh scales. This forms the 



bottom of the old quarry. 



Proceeding to a newer quarry on the east, the above section 

 is repeated as far as No. 13 ; and is presumed to continue as 

 follows : — 



14. Shale, with scales of Fish and Cyclas major ? on the under side. 



15. Clay, with Ostrea and lenticular bands of chert, containing Cyrena 



or Cyclas 4 



16. Cinder, with large Ostrea ; marly at the top, sandy at the bottom, 



with Carrfmm and Trigonim 1 10 



17. Laminated sand and clay 7 



18. Very hard fine-grained sandy rock 1 



19. Ditto, not so fine '. 8 



20. Sandy rock, ^^^th casts of Cyrraa or Cy<?/as 6 



21. Fine white limestone, like the Swanage "freestone" 1 



22. Ribbon clays and sands, with compressed shells 1 



23. Hard crystalline Umestone, with comminuted shells, Cypris and 



Cyclas 1 6 



Nos. 21 and 23 may be observed in two small quarries where 

 there is a lime-kiln, towards Teffont ; and then follow — 



24. Brown sand, full of crushed Bivalves and 5er/;?</(K 9 



25. Blue and grey laminated clay with Umestone nodules, and thin 



" beef " and crushed Bivalves 1 



* On the rising ground op]iosite this quarr)*, and about parallel with Nos. 8 and 9, 

 in a partial excavation, many years ago I observed thin slatv hmestone, contaiuing 

 traces of Insects, Archaeoniscus, and Lepfolepis Brbdiei. 



