Pteropod ooze

...The southern limit of their distribution in all three oceans is about 50° south latitude, where they border on siliceous ooze. (2) Pteropod ooze Pteropods are planktonic mollusks with relatively large shells, generally 4-8 mm, sometimes reaching 20 mm, and are distributed mainly between 35° north and 35° south latitude. Their calcareous shells are mineralogically composed of aragonite, and are more easily dissolved in the deep sea than the calcareous shells (composed of calcite) of planktonic foraminifera. ...

*Some of the terminology that mentions "pteropod ooze" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…分布の南限は三大洋とも南緯50゜くらいで，ケイ質軟泥と接する。(2)翼足類軟泥pteropod ooze　翼足類は一般に4～8mm，ときに20mmに達する比較的大きな殻をもつ浮遊性軟体動物で，おもに北緯35゜から南緯35゜にわたり分布する。その石灰殻は鉱物学的にはアラゴナイトより成り，浮遊性有孔虫の石灰殻(方解石より成る)より深海では溶解しやすい。…

※「pteropod ooze」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報