title: Isolation and identification of sterols from a pleistocene sediment.
mesh_terms: D002140:California; D002784:Cholesterol / Q000302:isolation & purification; D002849:Chromatography, Gas; D002855:Chromatography, Thin Layer; D004987:Ethers / Q000032:analysis; D055593:Geological Phenomena; D005844:Geology; D013058:Mass Spectrometry; D012825:Silicon / Q000032:analysis; D013261:Sterols / Q000302:isolation & purification*
chemical_list: D004987:Ethers; D013261:Sterols; D002784:Cholesterol; D012825:Silicon