"They studied dO18 in N pachyderma, also constrained sedimentatino rate by tephra fromn 1947 dated to Hekla and 1918 at 15 cm dated to Katia."
"In another species (_S. catenulata_) what seems a minute chain of distinctly formed elliptical links drops down the middle of each flute; in yet another (_S. oculata_) the carvings are of an oval form, and, bearing each a round impression in its centre, they somewhat resemble rows of staring goggle-eyes; while the carvings in yet another species (_S. pachyderma_) consist chiefly of crescent-shaped depressions."
"When she sequenced the ribosomal DNA from three species - and Neogloboquadrina pachyderma-she found the genes to be so similar that, she says"