Rupelo Formation

{{short description|Geologic formation in Spain}}

{{Infobox rockunit

| name = Rupelo Formation

| image = Yacimiento de La Pedraja en Mambrillas de Lara, maqueta de dinosaurio.jpg

| caption = La Pedraja tracksite in Mambrillas de Lara

| type = Geological formation

| age = Berriasian
~{{fossil range|145|140}}

| period = Berriasian

| prilithology = Mudstone

| otherlithology = Marl

| namedfor = Rupelo

| namedby =

| region = Mambrillas de Lara, Burgos, Castile and León

| country = Spain

| coordinates = {{coord|42.1|N|3.5|W|display=inline,title}}

| paleocoordinates = {{coord|33.7|N|5.9|E|display=inline}}

| unitof = Tierra de Lara Group

| subunits =

| underlies = Valdeprado Formation

| overlies = Oncala Group
 Huérteles Formation

| thickness = ~{{convert|2|m|ft|abbr=on}}

| extent = Restricted to northwesternmost Cameros Basin; Sierra de la Demanda

| area = ~{{convert|1|km2|sqmi|abbr=on}}

| map = {{Location map+ | Spain#Spain Castile and León

| relief = 1

| width = 250

| float = center

| places =

{{Location map~ | Spain#Spain Castile and León

| lat_deg = 42.1

| lon_deg = -3.5

| mark = Green pog.svg

| marksize = 10

}}

}}

| map_caption =

}}

The Rupelo Formation is an Early Cretaceous (Berriasian) geologic formation in the Burgos Province of Castile and León in northern Spain. The formation crops out near the municipality Mambrillas de Lara in the northwesternmost part of the Cameros Basin in the Sierra de la Demanda.González Acebrón et al., 2010, p.89

Fossil sauropod tracks have been reported from the formation.Weishampel, et al., 2004, pp. 517-607 The formation was deposited under lacustrine 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 sauropods, theropods and ornithopods.[https://paleobiodb.org/classic/displayCollResults?collection_no=68465 Rupelo Formation] at Fossilworks.org An indeterminate titanosauriform sauropod humerus (MDS-VPCR, 214) similar to Duriatitan has been found in the formation,{{Cite journal|last1=Torcida Fernández-Baldor|first1=F.|last2=Canudo|first2=J. I.|last3=Huerta|first3=P.|date=2020-12-01|title=New data on sauropod palaeobiodiversity at the Jurassic-Cretaceous transition of Spain(Burgos)|journal=Journal of Iberian Geology|language=en|volume=46|issue=4|pages=351–362|doi=10.1007/s41513-020-00145-w|bibcode=2020JIbG...46..351T |s2cid=227258628 |issn=1886-7995}} as well as a camarasaurid teeth and an indeterminate macronarian fragment of a dentary (MDS-VPCR,851).{{Cite journal |last=Fernández-Baldor |first=F. Torcida |last2=Huerta |first2=P. |last3=Puértolas-Pascual |first3=E. |last4=Canudo |first4=J. I. |date=March 2024 |title=New teeth of a basal Macronarian (Sauropoda) from the Jurassic–Cretaceous transition of Spain |url=https://link.springer.com/content/pdf/10.1007/s41513-023-00217-7.pdf |journal=Journal of Iberian Geology |language=en |volume=50 |issue=1 |pages=27–39 |doi=10.1007/s41513-023-00217-7 |issn=1698-6180}}

The municipality of Mambrillas de Lara has created a dinosaur park.