1850 Dana Geol. viii. 438Arenaceo-argillaceous deposits. 
1881 Darwin Veg. Mould 275Arenaceo-calcareous loam. 
arenaceo-
combining form 
Etymology: perhaps from French arénacéo-, from Latin arenaceus 
 : arenaceous and 
< arenaceo-argillaceous >
< arenaceo-argillaceous >