Producción CyT

E. Vlachos, V. D. Crespo, M. Ríos Ibañez, A. Gamonal, E. Jiménez Hidalgo, R. Guerrero-Arenas, F. A. M. Arnal, A. Allende Mosquera, and J. González-Dionis (eds) (2025) Book of Abstracts of the 5th Palaeontological Virtual Congress, 392 pp. - EXCEPTIONAL RECORD OF DINOSAURS TRACKS FROM THE LECHO FORMATION (UPPER CRETACEOUS), JUJUY, ARGENTINA

Congreso

Autoría:

LÓPEZ ISLA, GABRIEL RICARDO ; Díaz-Martínez, Ignacio ; Citton, Paolo ; Alonso, Guido Ezequiel ; Rivadeneira, Lucia ; Krapovickas, Pedro Alejandro ; Horta, Luis ; de Valais, Silvina

Fecha:

2025

Editorial y Lugar de Edición:

ISSN:

978-84-09-71275-5

Resumen *

A new ichnological site were recently discovered in fluvial facies of the UpperCretaceous (Maastrichtian) Lecho Formation (Lomas de Olmedo sub-basin, BalbuenaSubgroup, Salta Group) at Finca Tapiete locality (Jujuy Province, NW Argentina). Itconsists of more than 500 dinosaur tracks preserved as convex epireliefs over asurface of approximately 1,400 square metres (Dip: 340°; DI: 70° NE; I: 18°). Thefootprints, most likely due to differential weathering, are composed of whitish, finegrained sandstones that constitute the infill of original concave epireliefs. They areincluded within a succession composed of fine- to medium-grained, reddish-greysandstones interbedded with thinner, reddish clayey siltstone levels. The ichnitesexhibit diverse morphologies. Some tracks are tridactyl, (around 43 cm long and45 cm wide), with elongated and slender digit impressions, preliminarily suggestingthey were produced by hadrosaurid trackmakers. Other tracks, undetermined,wider than long (average length and width of 40 cm and 20 cm, respectively) aresubcircular in shape, lacking clear digit impressions. This new ichnosite is remarkablegiven the scarcity of vertebrate fossil tracks reported from the Lecho Formation todate and provides the opportunity to compare the new ichnological material withthat reported from the Maastrichtian transitional facies of the overlaying YacoraiteFormation. These comparisons offer valuable insights into potential changes inichnofaunal assemblages driven by the contrasting depositional settings andenvironmental dynamics of the Lecho and Yacoraite formations. The exceptionalpreservation and abundance of tracks at Finca Tapiete locality, underscore itssignificance as a reference point for understanding vertebrate behaviour andpalaeoecological transition in the region. Información suministrada por el agente en SIGEVA

Palabras Clave

Salta GroupLecho FormationGondwanan ichnofaunas