What is a sedimentary rock made from shekels and sea animals?

A sedimentary rock made from shekels and sea animals could be a playful reference to the concept of "fossiliferous limestone." This type of rock forms from the accumulation of marine organisms, such as shells and coral, along with other sediments. The mention of shekels, a historical currency, could symbolize the idea of ancient trade or commerce in coastal regions where such rocks might be found. However, in a geological sense, shekels themselves wouldn't contribute to the rock's formation.