The Rupelo Formation is an

Early Cretaceous The Early Cretaceous (geochronology, geochronological name) or the Lower Cretaceous (chronostratigraphy, chronostratigraphic name) is the earlier or lower of the two major divisions of the Cretaceous. It is usually considered to stretch from 143.1 ...

(

Berriasian In the geological timescale, the Berriasian is an age/ stage of the Early/Lower Cretaceous. It is the oldest subdivision in the entire Cretaceous. It has been taken to span the time between 143.1 ±0.6 Ma and 137.05 ± 0.2 (million years ago) ...

) geologic

formation Formation may refer to: Linguistics * Back-formation, the process of creating a new lexeme by removing or affixes * Word formation, the creation of a new word by adding affixes Mathematics and science * Cave formation or speleothem, a secondary ...

in the

Burgos Province The province of Burgos is a province of northern Spain, in the northeastern part of the autonomous community of Castile and León. It is bordered by the provinces of Palencia, Cantabria, Vizcaya, Álava, La Rioja, Soria, Segovia, and Valladoli ...

Castile and León Castile and León is an Autonomous communities of Spain, autonomous community in northwestern Spain. Castile and León is the largest autonomous community in Spain by area, covering 94,222 km2. It is, however, sparsely populated, with a pop ...

in northern

Spain Spain, or the Kingdom of Spain, is a country in Southern Europe, Southern and Western Europe with territories in North Africa. Featuring the Punta de Tarifa, southernmost point of continental Europe, it is the largest country in Southern Eur ...

. The formation crops out near the municipality

Mambrillas de Lara Mambrillas de Lara is a municipality and town located in the province of Burgos, Castile and León, Spain. According to the 2004 census ( INE), the municipality has a population of 69 inhabitants. People from Mambrillas de Lara * Lorenzo Juarr ...

in the northwesternmost part of the Cameros Basin in the

Sierra de la Demanda Sierra de la Demanda is a mountain sub-range situated in the northern Iberian Peninsula. The Sierra de la Demanda area provides the habitat for '' Lissotriton helveticus punctillatus'' (Schmidtler 1970), a subspecies of the palmate newt. Geogr ...

.González Acebrón et al., 2010, p.89 Fossil

sauropod Sauropoda (), whose members are known as sauropods (; from '' sauro-'' + '' -pod'', 'lizard-footed'), is a clade of saurischian ('lizard-hipped') dinosaurs. Sauropods had very long necks, long tails, small heads (relative to the rest of their b ...

tracks have been reported from the formation.Weishampel, et al., 2004, pp. 517-607 The formation was deposited under

lacustrine A lake is often a naturally occurring, relatively large and fixed body of water on or near the Earth's surface. It is localized in a basin or interconnected basins surrounded by dry land. Lakes lie completely on land and are separate from t ...

conditions in a shallow carbonate lake, with some exposure events in the sedimentary sequence. Imprints of dinosaurs were made in carbonate mud, after they were infilled with marl. Dinosaur tracks have been assigned to

theropod Theropoda (; from ancient Greek , (''therion'') "wild beast"; , (''pous, podos'') "foot"">wiktionary:ποδός"> (''pous, podos'') "foot" is one of the three major groups (clades) of dinosaurs, alongside Ornithischia and Sauropodom ...

s and

ornithopod Ornithopoda () is a clade of ornithischian dinosaurs, called ornithopods (). They represent one of the most successful groups of herbivorous dinosaurs during the Cretaceous. The most primitive members of the group were bipedal and relatively sm ...

s.Rupelo Formation
at

Fossilworks Fossilworks was a portal which provides query, download, and analysis tools to facilitate access to the Paleobiology Database, a large relational database assembled by hundreds of paleontologists from around the world. History Fossilworks was cr ...

.org An indeterminate

titanosauriform Macronaria is a clade of sauropod dinosaurs. Macronarians are named after the large diameter of the nasal opening of their skull, known as the external naris, which exceeded the size of the orbit, the skull opening where the eye is located (hence ...

sauropod humerus (MDS-VPCR, 214) similar to ''

Duriatitan ''Duriatitan'' is a genus of titanosauriform sauropod dinosaur that lived in the Late Jurassic in what is now England. The holotype specimen of ''Duriatitan'', BMNH 44635, is a partial left upper arm bone which was found by R.I. Smith nea ...

'' has been found in the formation, as well as a camarasaurid teeth and an indeterminate macronarian fragment of a dentary (MDS-VPCR,851). The municipality of Mambrillas de Lara has created a dinosaur park.

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