Sapropel vs Lamalginite - What's the difference?
sapropel | lamalginite |
(geology) An aquatic sludge-like sediment rich in organic matter formed in oxygen-free areas at the bottom of lakes, seas etc.
*2011 , (Chris Stringer), The Origin of Our Species , Penguin 2012, p. 47:
*:Another instance in which Mediterranean sapropels have provided clues about events deep within the African continent is the ‘greening’ of the Sahara about 120,000 years ago.
An alginite found in sapropel and composed of thin-walled colonial or unicellular algae that occur as distinct laminae, cryptically interbedded with mineral matter.