part 3] 



SUCCESSION OF THE AYONIAIS^ AT CLIFTOIf. 



239 



VI. Vertical Section of the Eight Bank of the Avon 

 (as shown in the main section). 



ThicJcness in 

 ft. in. 



f about 8 



Km 



83 ft. 



25 ft. 



Ki 



70 ft. 



13 6 

 1 



27 6 



about 4 



12 



J 

 6 6 



1 

 9 6 



4 



3 3 



17 9 



3 6 



6 



2 6 



19 6 



i^ about 44 



Lithology. 



Gap : section bi'icked up. 

 r Shale alternating with sand}' 

 3 mudstone and argillaceous 

 I limestone coutainii7g- Ostra- 

 va cods and calcareous algae. 

 Compact limestone, with abun- 

 dant ostracods and other 

 fossils. 



fShale, with subordinate bands 

 I of sandy mudstone and argil- 

 -l laceous limestone containing 

 ostracods and calcareous 

 algae. 



f Limestone-band ; lower part 

 I compact, crystalline, and 

 <^ thickl}^ bedded, with crinoids, 

 I ostracods, and bryozoa; upper 

 (_ part marly and nodular, 

 r Thick shale, with a marl}-^ 

 < nodular band 5 to 6 feet 

 (. from the top. 

 f'Thinl3'-bedded limestone and 

 I shale, the former very com- 

 J pact and black when un- 

 I weathered ; some bands 

 crowded with ostracods and 

 lamellibranchs. 

 Band of compact black lime- 

 \ stone crowded with ostracods. 

 C Reddish shale and calcareous 

 X flitggy beds. 



! Massive bed of red crinoidal 

 limestone ; the top has the 

 character of pseudobreccia. 

 /'Thinly-bedded reddish lime- 

 \ stone and shale, with at the 

 1 base a 6-inch band of yellow 

 L dolomite-mudstone. 

 C Thickly-bedded, red, crinoidal 

 X limestone. 



Thinly-bedded sandy limestone, 

 f Somewhat gritty and crinoidal 

 ■< limestone with teeth of fishes 

 (. and coprolites. 

 Compact, somewhat laminated, 

 sandy limestone with scat- 

 tered phosphate-nodules. 

 Shale, with subordinate bands 

 of highly fossiliferous lime- 

 stone, generally crinoidal. 

 Section bricked up. ^ 



Topograjpliical details, etc. 



^ The section of Km described is 

 that in the Lower Avonmouth 

 line. 



;>First llodiola Phase. 



L. 



Crops out 

 cutting:. 



at the base of the 



J> Bryozoa-Bed. 



J 



Palate-Bed. 



Q. J. a. S. No. 307. 



