1863.] 



DAY LIAS OF DORSETSHIRE. 



283 



able feature in the cliff, though very uninteresting to the collector. 

 They are succeeded by 160 feet of grey micaceous marl (d). Two or 

 three thin bands of mudstone and of occasional nodules occur in the 

 lower part of this mass ; and at rather more than 100 feet over the 

 " Three Tiers " a thicker band (e), containing shells and calcareous 

 concretions, stands out from the face of the cliff. Underneath this 

 thick band is a curious and persistent layer of small nodules (/), con- 

 taining, chiefly, fragments of Ammonites. The mass of grey marls 

 terminates with a layer made up of shells and fragments of Penta- 

 crinus ; and this is immediately overlain by a bed of large sandstones 

 from 4 to 6 feet in thickness, which is again succeeded by large 

 nodular masses of indurated sand. Over the nodular layer occur 

 the Middle Lias sands (a), grey and marly in the lower part, but gra- 

 dually becoming brown and more arenaceous in their upper portion. 

 Nodules are plentifully scattered through these ferruginous sandy 

 shales and sands, which are here about 60 feet in thickness, and are 

 succeeded by Cretaceous beds. 



Fig. 3. — Vertical Section of the Middle Lias at the Golden Cap. 

 Greensands, &c. 



feet. 



a. Grey and Brown sands with nodules ... 70 



b. Starfish-bed. 



c. Shell-bed. 



d. Grey micaceous marl with layers of mudstones 160 



e. Mudstone with nodular concretions and Shells 4 

 /. Small nodules containing Ammonites. 



g. The Three Tiers 23 



h. Grey marls with the Green Ammonite-nodules 100 

 i. The Belemnite-stone. 



We have, therefore, in the Golden Cap, about 290 feet of grey 

 marls, capped by about 60 feet of sands with nodules, all belonging 

 to the Middle Lias. 



Passing eastwards over a small upthrow, mentioned by De la 

 Beche, there occurs, at the Coastguard-station at Seatown, a power- 



