abstract the steam distilled oil obtained from the berries of juniperus macrocarpa gathered in the fossil sand dunes of huelva, southwest spain, was analyzed by gc and gc/ms in combination with retention indices. the oil contained -pinene (59.8-70.5%) and myrcene (14.8-15.2%) as major constituents and moderate amounts of -muurolene (2.5-5.5%). in addition to these components, minor amounts of -pinene (2.5-3.4%), limonene (1.1-1.3%), terpinolene (0.9-1.4%), -caryophyllene (0.4-0.7%), -cadinene (0.1-1.1%), -cadinene (0.4-1.0%) and -cadinol (0.2-0.4%) and lower quantities of diterpenes were also identified.