Hornitos Formation

Last updated
Hornitos Formation
Stratigraphic range: Late Cretaceous, Campanian–Maastrichtian
Type Geological formation
Lithology
Primary Limestone, sandstone, conglomerate
Other Marl, tuff
Location
Coordinates 28°00′S70°18′W / 28.0°S 70.3°W / -28.0; -70.3
Approximate paleocoordinates 30°36′S54°30′W / 30.6°S 54.5°W / -30.6; -54.5
Region Atacama
CountryFlag of Chile.svg  Chile
Extent Algarrobal Basin
Relief Map of Chile.jpg
Lightgreen pog.svg
Hornitos Formation (Chile)

The Hornitos Formation is a Campanian geologic formation of the Algarrobal Basin in the Atacama Region of northern Chile. The formation comprises limestones, sandstones, conglomerates, marls and tuff. Dinosaur remains are among the fossils that have been recovered from the formation, including the sauropod Arackar licanantay . [1]

Contents

Description

The Hornillos Formation, deposited in the Algarrobal Basin, [2] comprises sandstones, limestones, conglomerates, and caliches, intercalated with lavas and andesitic breccias and various volcanic rocks. Between these last is a conspicuous layer of rhyo-dactitic lithic tuff, which reaches up to 10 metres (33 ft) in thickness. Bones of indeterminate titanosaurs appear in a marly limestone stratum of 10 metres (33 ft) thick with decimeter-sized calcareous concretions. The smallest pieces were found as rollings, whereas the larger piece was included in the limestone. [3]

The Hornitos Formation formerly was thought to be of Paleocene to Eocene age. [4] The formation may be older and belong to the Early Cretaceous, as a granite intruded the rocks about 105 ± 10 Ma. [5]

Fossil content

Color key
Taxon Reclassified taxonTaxon falsely reported as presentDubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Dinosaurs

Sauropods

Sauropods of the Hornitos Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Arackar [6] A. licanantay Atacama Region Campanian to MaatrishtianFemur, Humerus and IschiumA lithostrotian titanosaur; closely related to Isisaurus colberti .
Arackar licanantay.jpg

See also

Related Research Articles

<i>Saltasaurus</i> Extinct genus of dinosaurs

Saltasaurus is a genus of saltasaurid dinosaur of the Late Cretaceous period of Argentina. Small among sauropods, though still heavy by the standards of modern creatures, Saltasaurus was characterized by a short neck and stubby limbs. It was the first genus of sauropod known to possess armour of bony plates embedded in its skin. Such small bony plates, called osteoderms, have since been found on other titanosaurians.

<i>Neuquensaurus</i> Extinct genus of dinosaurs

Neuquensaurus is a genus of saltasaurid sauropod dinosaur that lived in the Late Cretaceous, about 80 million years ago in Argentina in South America. Its fossils were recovered from outcrops of the Anacleto Formation around Cinco Saltos, near the Neuquén river from which its name is derived.

<span class="mw-page-title-main">Urbión Group</span>

The Urbión Group is a geological group in Castile and León and La Rioja, Spain whose strata date back to the Early Cretaceous (late Hauterivian to late Barremian. The formations of the group comprise a sequence of brown limestones in a matrix of black silt, sandstones, claystones and conglomerates deposited under terrestrial conditions, in alluvial fan and fluvial environments.

<span class="mw-page-title-main">Camarillas Formation</span> Geological formation in Aragon, Spain

The Camarillas Formation is a geological formation in the Teruel Province of Aragón, Spain whose strata date back to the Early Cretaceous. The sandstones, mudstones and conglomerates of the formation, that due to syn-sedimentary faulting varies greatly in thickness from 300 to 800 metres, were deposited in fluvial, deltaic and lacustrine environments.

<span class="mw-page-title-main">Enciso Group</span> Spanish geological formation

The Enciso Group is a geological formation in La Rioja, Spain whose strata date back to the Early Cretaceous.

The Arén Formation or Arén Sandstone is a geological formation in the Tremp-Graus Basin around Arén, Catalonia, Spain whose strata date back to the Late Cretaceous. Dinosaur remains are among the fossils that have been recovered from the formation. The formation dates to the Campanian to Maastrichtian and underlies the Tremp Group.

The Viñita Formation is a geological formation in Coquimbo, Chile, whose strata date back to the Late Cretaceous. Dinosaur remains are among the fossils that have been recovered from the formation.

The Los Blanquitos Formation is a geological formation in Salta Province, Argentina whose strata date back to the late Campanian to early Maastrichtian age of the Late Cretaceous Period. Dinosaur remains are among the fossils that have been recovered from the formation. The formation consists of friable, micaceous, grayish-red sandstones with quartz pebbles containing small carbonate veins. In the base of this layer the remains of a titanosaurid dinosaur were discovered. Above the layer with bones appears a lens of thick, greenish-gray, calcareous, very hard sandstone with pebbles and gravel. The bones were covered by a "halo" of the same rock but of greenish or grayish color, especially visible because the normal sediment is red. The bed thickness is 1.5 metres (4.9 ft).

<span class="mw-page-title-main">Allen Formation</span> Geological formation in Argentina

The Allen Formation is a geological formation in Argentina whose strata date back to the Late Cretaceous (middle Campanian to early Maastrichtian. Dinosaur remains are among the fossils that have been recovered from the formation. Indeterminate chelid remains and other vertebrates have also been discovered in this formation.

The Guichón Formation is a Late Cretaceous geologic formation of the Paysandú Group in Uruguay. Dinosaur remains are among the fossils that have been recovered from the formation.

<span class="mw-page-title-main">Villar del Arzobispo Formation</span>

The Villar del Arzobispo Formation is a Late Jurassic to possibly Early Cretaceous geologic formation in eastern Spain. It is equivalent in age to the Lourinhã Formation of Portugal. It was originally thought to date from the Late Tithonian-Middle Berriasian, but more recent work suggests a Kimmeridigan-Late Tithonian, possibly dating to the Early Berriasian in some areas. The Villar del Arzobispo Formation's age in the area of Riodeva in Spain has been dated based on stratigraphic correlations as middle-upper Tithonian, approximately 145-141 million years old. In the area of Galve, the formation potentially dates into the earliest Cretaceous.

The Puerto Yeruá Formation is a Late Cretaceous geologic formation in the Paraná Basin, pertaining to Entre Ríos Province, Argentina. Dinosaur remains are among the fossils that have been recovered from the formation, as well as egg fragments and fossilized wood.

The Higueruelas (Spanish) or Higuerueles Formation (Catalan) is a Tithonian geologic formation in the Teruel and Valencia provinces of Spain. Fossil sauropod tracks have been reported from the formation.

The Colorado Formation is a Late Cretaceous (Campanian to Maastrichtian geologic formation that is exposed within the Colorado Basin in the southeastern part of La Pampa Province, Argentina. Fossil dinosaur eggs of Sphaerovum erbeni have been reported from the nonmarine, fluvial strata of this formation.

Sphaerovum is an oogenus of dinosaur egg that has only been discovered in South America.

<i>Atacamatitan</i> Extinct genus of dinosaurs

Atacamatitan is a genus of titanosaurian sauropod dinosaurs from the Late Cretaceous Tolar Formation of Chile.

Jorquera is a caldera in Chile, 70 kilometres (43 mi) southeast of Copiapo.

Caldera Basin is a sedimentary basin located in the coast of northern Chile west of Copiapó. The basin has a fill of marine sediments of Late Cenozoic age. With a north–south extension of 43 kilometres (27 mi) and an east–west width of 20 kilometres (12 mi) the basin occupies an area between the coast and the Chilean Coast Range and between the port of Caldera and the mouth of Copiapó River. The sedimentary fill rests on metamorphic rocks of Paleozoic age and on plutonic rocks of Mesozoic age.

The Pajarito Mountains are a small mountain range in the Atacama Desert of Chile on the west coast of South America. Together with Paico Peak they divide the Algarrobal Basin into two hydrological units.

<i>Arackar</i> Genus of lithostrotian dinosaur from the Late Cretaceous period

Arackar is an extinct genus of lithostrotian sauropod, possibly part of the Saltasauridae, discovered in the Hornitos Formation of Atacama Province, Chile. The genus contains a single species, Arackar licanantay, described by Rubilar-Rogers et al. in 2021.

References

  1. Weishampel, et al. (2004). "Dinosaur distribution." pp. 517–607.
  2. Abad, 1982, p. 5
  3. Hornitos at Fossilworks.org
  4. Rivera Cabello, 1985, p. 5
  5. Rivano et al., 1986, p. 28
  6. Rubilar-Rogers D, Vargas AO, Riga BG, Soto-Acuña S, Alarcón-Muñoz J, Iriarte-Díaz J, Arévalo C, Gutstein CS (2021). "Arackar licanantay gen. et sp. nov. a new lithostrotian (Dinosauria, Sauropoda) from the Upper Cretaceous of the Atacama Region, northern Chile". Cretaceous Research. 124: Article 104802. Bibcode:2021CrRes.12404802R. doi:10.1016/j.cretres.2021.104802. S2CID   233780252.

Bibliography

Further reading