The earliest products of volcanism on Mont Pelee consist
of brecciated lava flows, epiclastic breccias, and minor lava flows of
acid andesite composition. Breccias are the most abundant, with two main
types being identified: Tombeau Caraibe and Macouba. Tombeau Caraibe deposits
are generally disorganized and are interpreted as the products of non-explosive
disintegration of lava during flowage. Macouba deposits are usually stratified
and their origin is poorly understood.