Hiló Formation

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The Hiló Formation is a Middle Cretaceous rock layer in the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. It dates to Late Albian to Early Cenomanian (about 102–98 million years ago) and is more than 470 meters thick at its reference section. The formation is mainly shale, but also contains sandstone, limestone and siltstone. It belongs to the Villeta Group, lying above the Capotes Formation and below the Simijaca Formation. It was named in 1931 by Hubach after Caserío Boquerón de Hiló near Anapoima; the type locality is near the Apulo–Anapoima road, east of Viotá, with other occurrences in Tolima. The Hiló Formation was deposited on an open marine platform in pelagic to hemipelagic waters, with a maximum flooding surface. It is fossil-rich, especially with ammonites and other marine species. It is roughly time-equivalent to the Une and Pacho Formations. West of Guayabal de Síquima, it is offset by the Vianí Fault.