1857.] 



BUCKMAN — OOLITES. 



103 



Here, then, we have a total of 43 species, only 1 1 of which are 

 truly liassic. It should here be remarked that this list does not 

 include the Ammonites bifrons or the A. Jimbriatus, upon the former 

 of which Dr. Wright, and, after him, Mr. Hull have laid such stress ; 

 the truth being, that both Dr. Wright's specimens of these Ammo- 

 nites (for his matrix was traced) and my own were obtained from as 

 much as 20 feet below the oolite- sands, in the true micaceous beds 

 of the Upper Lias Shales, the position of which will be made plain by 

 the accompanying section of beds at Frocester Hill : — 



Fig. 1. — Section at Frocester Hill. 



Cephalopoda-bed. 



ft. in. 



1. Oolite - freestone, with two 

 bands of obliquely-laminated 

 beds 40 



2. A sandy Oolite, with Phola- 



domya 6 



3. Ragstone 20 



4. "Cephalopoda-bed" 4 



5. Oolite-sands 60 



ft. in. 

 5a. Position of Inferior Oolite Shells 

 at Nailsworth. 



6. Upper Lias Shales — very mica- 



ceous 20 



7. Band of indurated White Lias, 



with Am. bifrons and A. Jim- 

 briatus 1 



8. Upper Lias Shales, blue. 



Now, if I am right in my interpretation of this matter, Dr. Wright 

 has gone into the Lias Shales for his proofs that the Cephalopoda- 

 bed, 80 feet higher, is Lias ; nor is it difficult to understand how he 

 may have been led into this error, inasmuch as the upper part of the 

 Lias Shales has become oxidized from atmospheric exposure ; and 

 besides, on this slope the Inferior Oolite Sands have fallen over them, 



^^T 



