What can increased organic matter in sediments indicate?

Increased organic matter in sediments is often a clear indicator of changes in ocean productivity. Higher levels of organic matter typically result from enhanced biological activity in the ocean, such as phytoplankton blooms. When environmental conditions are favorable—like an increase in nutrient availability or optimal light conditions—phytoplankton can proliferate, leading to greater organic material being produced and subsequently sinking to the ocean floor.

This accumulation of organic matter reflects the productivity of the marine ecosystem at that time, suggesting a thriving community of microorganisms and other marine life. Thus, interpreting a rise in organic matter as a signal of a shift in ocean productivity allows scientists to understand better the ecological dynamics and changes occurring in ocean environments.