Lower Cretaceous nannofossils of ODP Holes 113-682B and 113-693A

Organic-rich, moderately to sparsely nannofossiliferous Lower Cretaceous claystones ("black shales") were cored at two Ocean Drilling Program Leg 113 sites on the continental...富有机质、中等至稀疏含超微化石的下白垩统黏土岩（"黑色页岩"），已在两个位于陆域的大洋钻探计划（Ocean Drilling Program）第113航次站位中被钻取岩芯。