Cretaceous planktonic foraminifera and calpionellids from the Gulf of Mexico

Drilling on Leg 77 resulted in eight single-bit holes at five sites extending across the Yucatan Channel in the southeastern Gulf of Mexico. Sites 535, 539 (aborted hole of 7.5...第77钻探航次在墨西哥湾东南部尤卡坦海峡沿线的5个站位完成了8个单钻头钻孔。其中535、539站位存在长度为7.5……的中途报废钻孔。