noun
belemnite
Fossil term for an extinct squid-like cephalopod; used in paleontology and geology. The word is a compound of 矢 (arrow) and 石 (stone), referring to the pointed shape of the fossil.
矢石は、ジュラ紀の地層からよく見つかる化石です。
Belemnites are fossils often found in Jurassic strata.