Event label	Optional label	Method/Device	Abbreviation	O2A Registry URI	Date/Time	Latitude	Longitude	Elevation	Date/Time end	Latitude end	Longitude end	Elevation end	Comment
83-504B		Drilling/drill rig	DRILL		1981-11-22T00:00:00	1.22720	-83.73020	-3460	1982-01-02T00:00:00				Leg 83 of DSDP was devoted entirely to coring and experiments in Hole 504B, the deepest borehole to date into the oceanic crust. Hole 504B now extends over a kilometer into basement, nearly twice as far as any other DSDP hole, and it is the only DSDP hole to have clearly penetrated into the intrusive sheeted dikes that underlie the extrusive pillow lavas of the upper oceanic crust. At Hole 504B, Leg 83 continued an ongoing DSDP effort that began during Legs 68, 69, and 70 in 1979, and also included part of Leg 92 in 1983. 71 cores; 514 m cored; 0 m drilled; 21 % recovery
83-504_Site		Composite Core	COMPCORE		1981-11-22T00:00:00	1.22720	-83.73020	-3460	1982-01-02T00:00:00				71 cores; 514 m cored; 0 m drilled; 21% recovery