Table 3. Different lithologies and their organic-carbon characteristics at Hole 893A.
Lithology	Lith. subunit	Isotope stages	TOC  (%)	HI (mgHC/gC)	Type of OC	Source
Laminated olive intervals	IA, ID	1, 5e, (5a)	1.5 to 4.5	100 to 250	Mixed (++ marine)	Phytoplankton, macroalgae ?; terrigenous biomass
Non-laminated olive intervals	IB, IC, IE, IF	2, 3, 4, 5b, 5d, 6	1.2 to 2.5	50 to 150	Mixed (++terrigenous)	Terrigenous biomass; phytoplankton, macroalgae ?
Thin grey beds	IA, ID	5e, 1	0.9 to 1.8	40 to 90	Terrigenous	Flood/turbidity deposits	
Sand beds	IC	3, 5b	0.1 to 0.3	40 to 80 	Terrigenous	Turbidites
Note: The hydrogen index values of the organic-carbon-poor sandy beds should be interpreted with major caution.