﻿SUMMARY OF THE COiNTENTS. 707 



compressa, timoclea ovata, maocma calcaria, m. baltica, ahra 

 longicalUs, corhula gibba, saxicava ardica, gibbula cineraria, 

 aporrhais pes pelecani, turritélla terébra, nassa reticulata, 

 buccinum undatum. Most of the other species are rare. 



Remains of plants, especially of oak, fir, birch and hazel, 

 are common. 



The depth at which the isocardia clay has been deposi- 

 ted is estimated to be from about 15 to 40 metres. There is 

 no doubt that it is contemporaneous with the corresponding lit- 

 toral shell-banks, the tapes-banks. 



Pp. 474—490. 5. Isocardia Clay elsewhere than in the 

 Kristiania Valley. 



Clay-beds corresponding with the isocardia clay of the Kri- 

 stiania Valley are common, occurring very frequently all over 

 the Kristiania region, especially 



(pp. 474 — 480) in the valley of the Drammen river, 



(pp. 480 — 483) in the Sande valley, and at Holmestrand, 



(pp. 483 — 486) in the region Horten and Langesunds f jord, 

 and finally 



(pp. 486 — 490) in Smålenene, Bohuslån, etc. 



In the environs of Trondhjem also, corresponding clays 

 (still with the southern form isocardia cor). are known. 



The isocardia clay like the upper tapes-banks indicates a 

 climate milder than the present one. 



For special descriptions of the several occurrences, see the 

 Norwegian text. 



