Estratos de San Pedro
Introduction

**Estratos de San Pedro** is the name given to the sedimentary strata of [Paleogene age](/wiki/Paleogene "Paleogene") that crop out along [San Pedro River](/wiki/San_Pedro_River_%28Chile%29 "San Pedro River (Chile)"), [southern Chile](/wiki/Zona_Sur "Zona Sur"). The strata were initially described by [Juan Brüggen](/wiki/Juan_Br%C3%BCggen "Juan Brüggen") and later briefly investigated by [Henning Illies](/wiki/Henning_Illies "Henning Illies") who estimated their thickness at .
The strata are made up of [conglomerate](/wiki/Conglomerate_%28geology%29 "Conglomerate (geology)"), [sandstone](/wiki/Sandstone "Sandstone") and [mudstone](/wiki/Mudstone "Mudstone") ([Chilean Spanish](/wiki/Chilean_Spanish "Chilean Spanish"): *fangolita*). The clasts of the conglomerates are made up of [metamorphic rock](/wiki/Metamorphic_rock "Metamorphic rock") and the disposition of the conglomerates varies from clast\-supported to matrix\-supported. The sandstone and mudstone contains layers of [lignite coal](/wiki/Lignite "Lignite") that exceed  in thickness.


What types of rock are found in the sedimentary strata of Estratos de San Pedro?