276 



Dr. FiTTON on the Strata below the Chalk. 



univalve — perhaps a Paludina — occurs in such numbers, as in some places to form nearly 



the whole mass. 

 5. Portland stone; with numerous Trigoniae and Pernae. 



Great Hazeley. — In the principal quarry at this place the strata dip to about 20° east of 

 south, at an angle of about 4° ; and are traversed by joints nearly in the same direction. The 

 order is as follows : 



Stone-pit at Great Hazeley. 



. Feet. 

 r5. 



10. 



15. 



20. 



Ft. In. 

 6 



6 6 

 \ 1 6 



1 . Soil, forming a level and uniform surface 



2. Loam, brown and red ; containing fragments of ferruginous conglomerate, (carstone) 



and of a brown substance, like umber; passing below into ferruginous sand. .3 ft. to 



3. Thinly stratified firm clay or marl, of a light grey colour, approaching to stone, not 



effervescent, containing between the folia impressions ofplants, and including portions 

 of reddish sand, in horizontal masses of very unequal thickness. It breaks down 

 rapidly in water, like Fuller's earth, and its place corresponds best (so far as my 

 observations went) to that stratum ? 



4. Dark brown clay; like the Fuller's earth of Tilburstow (p. 139.), and of the pits near 



Aylesbury. Some of the masses into which it is easily divided, are polished, by 

 sliding on each other under pressure. At the bottom ferruginous sand alternates 

 with the clay 1 ft. to _ 



[All the preceding beds are much disturbed, and bent irregularly, so as to ac- 

 commodate themselves to a chasm in the strata below, — here called a "Gull" 

 (gulley ?), and quite analogous to those in the Isle of Portland mentioned at 

 p. 218. The manner in which these "gulls" are filled, proves that they must 

 have been excavated before the deposition of the matter which now occupies them. 

 But the surface of the ground above the opening shows no indication whatsoever 

 of disturbance.] 

 The Purheck strata seem to be wanting here ? 



[Portland Stone."] 



5. Stone, called "Curl"; grey calcareous grit. Often blue, in the interior of the 



masses ; containing thick oysters, and Pernae about 



6. Sand and clay, containing fragments of shells, and including at the bottom concre- 



tions of calciferous sandy stone, which abounds in petrifactions, especially Persia 

 quadrata 



7. Uniform whitish sand, and sandy stone, with Perna quadrata, and numerous Serpulae. 



[In another large quarry, 6. and 7. unite to form one bed about 7 feet thick.] 



2 



4 

 2 6 



