Rosablanca Formation
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The Rosablanca Formation is a geological formation of the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes and the Middle Magdalena Basin. The formation consists of grey limestones, dolomites and shales with at the upper part sandstones. The formation dates to the Early Cretaceous period; Valanginian epoch and has a thickness of 425 metres (1,394 ft) in the valley of the Sogamoso River.
Image: Blakey Pleist COL
Image: Blakey 020Ma COL
Image: Blakey 035Ma COL
Image: Blakey 050Ma COL
Arcabuco Formation
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The Arcabuco Formation is a geological formation of the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The formation consists of thick beds of light-coloured quartzitic sandstones and conglomerates with occasional shales and dates to the Late Jurassic and Early Cretaceous periods; Tithonian to Berriasian epochs. Dinosaur footprints have been found in the Arcabuco Formation near the Iguaque anticlinal outside Chíquiza, Boyacá.
Arcabuco Formation at the Sáchica rock shelter
Image: Blakey Pleist COL
Image: Blakey 020Ma COL
Image: Blakey 035Ma COL