The outcrops of Erin Formation are located in SW Trinidad at the western end of Iros Bay

Kugler surface geology map (1959) showing the location of the outcrops, a porcellanite outcrop not present on any legacy maps was identified at Point Coco

Drone photo of the porcellanite outcrop lignite beds are present at either side of the exposure

Photo showing the abrupt change of the porcellanite to unburnt claystones