1. A layer or body of sedimentary rock formed by the accumulation of skeletal remains and organic material from marine organisms in their original position of growth.
Usage: geology; paleontology; technical term

Examples

• The limestone biostrome contained abundant fossil shells and coral fragments.
• Geologists identified the biostrome as evidence of an ancient shallow marine environment.
• The biostrome layer was distinguished from surrounding sediments by its high concentration of organic material.
• Paleontologists studied the biostrome to understand the composition of the prehistoric reef community.