Quebrada de la Escalera, Valle del Tonco tracksite (Cretaceous of Argentina)

Also known as Leonardi locality 21

Where: Salta, Argentina (25.4° S, 66.0° W: paleocoordinates 27.9° S, 52.4° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Caliza Amblayo Member (Yacoraite Formation), Maastrichtian (72.1 - 66.0 Ma)

• lower part of formation, Balbuena Subgroup

• bed-level stratigraphic resolution

Environment/lithology: ooidal, yellow grainstone

• described as "tidal flat" and "supratidal"
• "Lithologically it is composed of limestones, sandy limestones, arenaceous limestones and pelites. The limestones are mostly oolitic and stromatolitic. The color of the group is yellow...There are abundant sedimentary structures such as ripples, dessication cracks, stromatolites, intraformational folds, and load marks...The track-bearing layer is an oolitic calcarenite."

Size class: macrofossils

Preservation: trace

Collected by M. Raskovski, R. N. Alonso in 1968, 1978

Collection methods: surface (in situ),

Primary reference: R. N. Alonso. 1980. Icnitas de dinosaurios (Ornithopoda, Hadrosauridae) en el Cretácico superior del norte de Argentina[Dinosaurian ichnites (Ornithopoda, Hadrosauridae) in the Late Cretaceous of northern Argentina]. Acta Geologica Lilloana 15(2):55-63 [M. Carrano/M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 45096: authorized by Matthew Carrano, entered by Matthew Carrano on 05.10.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

 Avetheropoda -
Carnosauria indet. carnosaur
informally called "Sirollichnus argentinensis" in Leonardi 1994
 Saurischia -
Hadrosaurichnus australis n. gen. n. sp. Alonso 1980 theropod
trackways, CNSV 10.020