These included desert sands, sand dunes, some loess deposits, and beach and alluvial deposits that contained little or no visible organic material.
(These; included; desert sands, sand dunes, some loess deposits, and beach and alluvial deposits) (beach and alluvial deposits; contained; little or no visible organic material)
These beach and alluvial deposits
included contained
desert sands, sand dunes, some loess deposits, and beach and alluvial deposits
little or no visible organic material