page_title: Tremp Formation
section_title: Fossil content
hierarchical_section_title: Tremp Formation / Paleontology / Fossil content
caption_attribution_description: English: Photo of an indeterminate dinosaur eggs in the Tremp Formation. courtesy: M. Wiemer
context_page_description: The Tremp Formation, alternatively described as Tremp Group, is a geological formation in the comarca Pallars Jussà, Lleida, Spain. The formation is restricted to the Tremp or Tremp-Graus Basin, a piggyback foreland basin in the Catalonian Pre-Pyrenees. The formation dates to the Maastrichtian to Thanetian, thus the formation includes the Cretaceous-Paleogene boundary that has been well studied in the area, using paleomagnetism and carbon and oxygen isotopes. The formation comprises several lithologies, from sandstone, conglomerates and shales to marls, siltstones, limestones and lignite and gypsum beds and ranges between 250 and 800 metres in thickness. The Tremp Formation was deposited in a continental to marginally marine fluvial-lacustrine environment characterized by estuarine to deltaic settings.
  The Tremp Basin evolved into a sedimentary depression with the break-up of Pangea and the spreading of the North American and Eurasian Plates in the Early Jurassic. Rifting between Africa and Europe in the Early Cretaceous created the isolated Iberian microplate, where the Tremp Basin was located in the northeastern corner in a back-arc basin tectonic regime.
context_section_description: Pollen
  Additionally, many pollen have been described from the Tremp Formation, east of Isona and 22 kilometres (14 mi) east of Tremp:
  Polypodiaceoisporites gracicingulis, P. maximus, P. tatabanyensis, P. vitiosus
  Leiotriletes adriennis, L. dorogensis, L. microadriennis
  Cycadopites kyushuensis, C. minar
  Monocolpopollenites dorogensis, M. tranquillus
  Semioculopollis croxtonae, S. praedicatus
  Cicatricosisporites cf. triangulus
  Cupressacites insulipapillatus
  Cupuliferoipollenites pusillus
  Cyrillaceaepollenites barghoorniacus
  Granulatisporites palaeogenicus
  Inaperturopollenites giganteus
  Labraferoidaepollenites menatensis
  Laevigatosporites haardti
  Minorpollis hojstrupensis
  Nudopollis minutus
  Oculopollis cf. minoris
  Pityosporites insignis
  Plicapollis serta
  Punctatisporites luteticus
  Retitricolporites andreanszkyi
  Rugulitriporites pflugi
  Subtriporopollenites constans
  Suemigipollis cf. triangulus
  Tetracolporopollenites halimbaense
  Trilobosporites (Tuberosisporites)
  Vacuopollis cf. concavux
  Granomonocolpites
  Patellasporites
  Platycaryapollenites
  Polyporites
  Retimonocolpites
caption: Indeterminate dinosaur eggs in the Tremp Formation near Basturs
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