440 



MR. J. F. JACKSOX OX 



[vol. Ixxviii, 



On the coast the westernmost exposure o£ the Junction-Bed is 

 -near the western end of Down CUff, where the faJciferum layer 

 rests dii'ectlv upon the 'marlstone/ A few yards east of this 

 first exposure a clay-band comes in between these layers, and 

 continues almost to the eastern extremity of Down Cliff, where 

 it passes into a band of earthy marly stone. Section I shows 

 the sequence near the western end of Down Cliff. 



Section II shows the sequence near the eastern end of Down 

 Cliff. Here the sfriafulum layer is present, and the inter- 

 falciferum-spinatuni clay-band reaches its maximum thickness. 



Section II — The Jusctiox-Bed axd CoyiiGuous Deposits, measceed 

 in situ NEAR THE Easteex Exd of Dowx Clief. 



Hemerse. 

 iJumoi'tierice. 



Striatulum. 

 I Traces ot" 

 pedicum and 

 eseri faunas '. 



Strata and Fauna. Feet incJiep. 



A. Blue, sandy, ' Upper Lias ' clay. Coarse-ribbed , 

 DumortiericB iu friable condition ; Belemnites j 

 sp. 



Transitional from 



B. Yellowish sand\' clay with ferruginous streaks. 1 

 IG + H . Grey earthy limestone, with many rotten 



limouitic nodules and rolled fossils. Grammo- 

 ceras spp. common. Top planed oif ver3' 

 smooth. 2 



[5317, Grammoceras aff. rtj^c^a.r S. B.; 4989, G. 

 aff. comptiim Hang; 5320 «, G. penestriatu- 

 lum S. B. ; 5319, G. aft", penestriatuhim S. B.; 



5315, 5318, G. aft\ penestriatulum S. B., hut 

 coarseh'-ribbed; 5320, G. aff. striatidum; 5317 a, | 

 G. aft", thouarsense, rather strongly ribbed; 



5316, Fseiidogramnioceras cf. yaclm S. B., but 

 more finely ribbed {pedicum fauna) ; 5322, Fseri- 

 ceras aft", eseri (Oppel), but more umbilicate.^ 



Strong parting. 

 K. AVhitish rubbly limestone. Small Hildoceras 



hifrons, Shi/ncJionella sp. 4 



[5-Jll (2 examples), Stolmorliyncliia houchardi 



hotlienhamptonensis j 

 Obscure pai'ting. 

 L. Pinkish-yellow conglomeratic limestone. Hildo- 

 ceras hifrons. 7 

 Obscure parting. 

 M. Similar limestone, but showing bright red 



blotches. Sarpoceras faJciferum. 6 



0. Very stift', gi'eyish-yellow, mottled clay. Xo 



fossils observed. 10 



R. Oolitic conglomeratic 'marlstone,' with a mark- 

 edly planed-ofi" top. JBelemnites spp. common, 

 Pseudopecteti tsquicalvis, WiynclioneUa tetra- 

 edra. \ 7 



Resting with very irregular base upon 

 T. Yellowish clayey sands. 



The ' marlstone ' of the Down-Cliff sections is almost certainly 

 only the lower layer of that deposit. Xo evidence of the upper or 

 serrata bed was found at Down Cliff, and the planed-off top of the 

 ' marlstone ' points to a considerable non-sequence. 



The ' marlstone ' at Down Cliff rests directly upon the Yellow 

 Sands, without the intervention of the clay-bed seen in Doghus 

 CHff and Thorncombe Beacon. At the eastern end of Down Cliff 



LilU (?) 



Bifrons. 



Falciferum. 



Pre- 



falciferum. 

 Spinatum. 



