Abundances of siliceous sponge spicules in ODP Site 120-748 (Table 1)

Siliceous sponge spicules are present and often diverse in sediments drilled by Ocean Drilling Program Leg 120. The sponge spicule assemblages are tabulated for Holes 748A and 748B. Neogene assemblages consist mostly of monaxons, whereas chelae, amphidiscs, discorhabds, polyaxons, and other spicule morphologies are often abundant in middle Eocene to upper Oligocene sediments.大洋钻探计划第120航次所钻取的沉积物中广泛分布硅质海绵骨针（siliceous sponge spicules），且其种类往往较为多样。研究人员对748A与748B两个钻孔的海绵骨针组合进行了制表统计。新近纪的海绵骨针组合以单轴骨针（monaxons）为主，而钳状骨针（chelae）、双盘骨针（amphidiscs）、盘状杆骨针（discorhabds）、多轴骨针（polyaxons）及其他骨针形态，在始新世中期至渐新世上部的沉积物中通常具有较高丰度。