F-10 

 Eocene or upper Cretaceous. The COST B2 well slightly to 

 the east placed the top of the Eocene at 4092 ft (1237 m) , 

 considerably deeper than the lowest reflector interface. 

 The dredges or cores taken in the Baltimore Canyon at 

 depths less than 1.3 km by any of the surveys that actually 

 sampled the outcrops have failed to produce sediments that 

 are very old. On the nearby slope, materials as old as 

 Eocene (40 m.y.B.P.) have been recovered at DSDP Sites 107 

 and 108, and in rock dredges at depths below 1.8 km. 



Oceanographer and Lydonia Canyons 



The shelf-edge strata of Georges Bank are planar, gently 

 seaward dipping top-set depositional units (Emery and Uchupi, 

 1972; Schlee et al^. , 1976; Schlee, 1978b). They represent 

 a period of up-building with little seaward progradation, a 

 style which has been persistent since the Mesozoic (100 m.y. 

 B.P.). The outcrop strata in the Oceanographer and Lydonia 

 Canyons are not only coarser than those of the Baltimore 

 Canyon, but at equivalent burial depths, they are also appre- 

 ciably more indurated. Furthermore, the Georges Bank region 

 received substantial amounts of Pleistocene age glacial out- 

 wash and locally transported glacial erratics giving this 

 region an anomalously high abundance of gravel, cobbles and 

 boulders. 



Oceanographer Canyon cuts more than 30 km into the 

 continental shelf; Lydonia cuts 20 km. Both canyons debouch 

 onto the continental rise at depths greater than 2 km. 



