Venado Formation
The Venado Formation (, Oir) is a geological formation of the Agua Blanca Group, in the Eastern Ranges of the Colombian Andes, cropping out along the Venado River in northern Huila. The sequence of pyrite containing dark grey micaceous shales interbedded with siltstones and sandstones dates to the Ordovician period; Middle to Late Floian epoch, and has a maximum thickness of in the type section.

The unit is one of the few Early Paleozoic fossiliferous formations of Colombia; many graptolites of the genus "Phyllograptus" have been found in the Venado Formation. The graptolites are mostly found in the silty beds and indicative of a fair weather environment on a siliciclastic shallow marine platform at the northern edge of Gondwana. The shallow sea where the Venado Formation was deposited ranged into the deeper cold Iapetus and Rheic Oceans, separating the South American continent of the time from Laurentia, Avalonia and Baltica.
Q736917
geological formation
Concept
None
Agua Blanca Group
UNK
Q143014
Eastern Ranges
LOC
Q739
Colombia
LOC
Q5456
Andes
LOC
Q531953
cropping out
Concept
None
Venado River
UNK
Q234920
Huila
LOC
Q50769
pyrite
Concept
Q114675
mica
Concept
Q751300
shale
Concept
Q565731
siltstone
Concept
Q13085
sandstone
Concept
Q62100
Ordovician
LOC
Q10528257
Middle to Late Floian
MEDIA
Q52459420
fossiliferous formations
UNK
Q332403
graptolite
Concept
Q2417429
Phyllograptus
Concept
Q1994702
environment
UNK
Q80583
Gondwana
LOC
Q581244
Iapetus
LOC
Q1891116
Rheic Ocean
LOC
Q858071
Laurentia
LOC
Q510087
Avalonia
LOC
Q805735
Baltica
LOC
Q85812914
Venado Formation
UNK
Q85812914
Venado Formation
UNK
Q85812914
Venado Formation
UNK
country
mountain range
located in the administrative territorial entity
country