ATLANT. DEEP-SEA EXPED. 1910. VOL. I.) 



DEPOSIT-SAMPLES 



11 



CONCLUSIONS. 



The number of deposit-samples received in the Chal- 

 lenger Office was 35. In one case the depth from which 

 the material (an earbone of a whale) was taken was not 

 stated, but the remaining 34 samples were from depths 

 between 23 and 2966 fathoms, distributed as follows: — 



5 samples from depths less than 500 fathoms; 



13 „ „ „ between 500 and 1000 fathoms; 



10 „ „ „ „ 1000 „ 2000 fathoms; 



6 „ „ „ over 2000 fathoms. 



3? 



Of the five samples from depths less than 500 

 fathoms the two shallowest ones (from 23 and 26 fathoms) 

 were tallow "armings" from the sounding lead, in which 

 principally calcareous shell-fragments were embedded, the 

 other three being Blue Muds from 84, 86 and 293 

 fathoms. 



Of the thirteen samples from depths between 500 and 

 1000 fathoms four were insufficient to determine the type 

 of deposit (in two cases stones and rock fragments being 

 brought up from 601 and 820 fathoms, in one case empty 

 Pteropod shells coming up from 664 fathoms, and in one 

 case grains of manganese and fTsh otoliths from 555 

 fathoms), five were Globigerina Oozes from 547, 688, 

 742, 746 and 981 fathoms, one was Globigerina Ooze 

 overlying Blue Mud from 835 fathoms, and three were 

 Blue Muds from 547, 571 and 600 fathoms. 



Of the ten samples from depths between 1000 and 

 2000 fathoms eight were Globigerina Oozes from 1122, 

 1256, 1422, 1423, 1703, 1739,^1768 and 1768 fathoms, 

 one was a Pteropod Ooze from 1185 fathoms, and in 

 the remaining case only stones were brought up from 

 1013 fathoms. 



The six samples from depths exceeding 2000 fathoms 

 were Globigerina Oozes from 2121, 2567, 2688, 2749, 

 2817 and 2966 fathoms. 



Of the thirty-five samples eight were insufficient to 

 indicate the deposit type (in three cases stones and rock 

 fragments, in two cases tallow „armings", in one case 



empty Pteropod shells, in one case the earbone of a 

 whale, and in one case fish otoliths with manganese grains, 

 being all that was available), the remaining twenty-seven 

 being referred to the following types: — 



Globigerina Ooze 19 



Globigerina Ooze overlying 



Blue Mud 1 



Blue Mud 6 



Pteropod Ooze • 1 



27~ 



The nineteen Globigerina Oozes range in depth from 

 547 to 2966 fathoms and are scattered over the North 

 Atlantic as far west as long. 44° W., occurring to the 

 north and south-west of Ireland and out into the open 

 ocean, in the Bay of Biscay, opposite the Straits of Gi- 

 braltar, in the vicinity of the Canary Islands, between 

 the Canary Islands and the Azores, and to the south 

 and west of the Azores. The Globigerina Ooze overlying 

 Blue Mud occurred to the north of the Rockall Bank in 

 835 fathoms. 



The six Blue Muds range in depth from 84 to 600 

 fathoms and occur in the Faroe Channel, to the south 

 of Ireland, in and on both sides of the Straits of Gibraltar, 

 that is to say both inside and outside of the Mediter- 

 ranean. The single Pteropod Ooze was taken from 1185 

 fathoms near the Canary Islands. 



The modifications necessitated by the inclusion of 

 this series of deposits in the map showing the distribution 

 of deep-sea deposits over the floor of the North Atlantic 

 are: (1) the extension of the Globigerina Ooze area 

 nearer the coasts of the British Islands to the south and 

 south-west,, as well as to the north, of Ireland, and its 

 extension also to the north of Rockall Bank; (2) the intro- 

 duction of both Globigerina Ooze and Pteropod Ooze in 

 the neigbourhood of the Canary Islands where they were 

 previously unrecorded. 



