Andean Geology 46 (1): 168-182. January, 2019 Andean Geology doi: 10.5027/andgeoV46n1-3141 www.andeangeology.cl Early Ordovician conodonts from the Santa Rosita Formation at Pantipampa, Iruya area, northwestern Argentina *Josefina Carlorosi1, Susana B. Esteban2, M. Franco Tortello3 1 Instituto Superior de Correlación Geológica (INSUGEO)- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Miguel Lillo 205, (4000) Tucumán, Argentina.
[email protected] 2 Instituto Superior de Correlación Geológica, Facultad de Ciencias Naturales e Instituto Miguel Lillo, Universidad Nacional de Tucumán, Miguel Lillo 205, 4000 San Miguel de Tucumán, Argentina.
[email protected] 3 Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de La Plata, División Paleozoología Invertebrados, Museo de La Plata, Paseo del Bosque s/n, 1900 La Plata, Argentina.
[email protected] * Corresponding author:
[email protected]. ABSTRACT. A conodont assemblage recovered from the middle part of the Santa Rosita Formation at Pantipampa (Iruya area, northwestern Argentina) is described herein. It includes Cordylodus angulatus Pander, C. cayesi Druce and Jones, C. lindstromi Druce and Jones, C. hastatus Barnes, Furnishina furnishi Müller, Kallidontus gondwanicus Zeballo and Albanesi, Phakelodus elongatus An, Phakelodus tenuis (Zhang), Proconodontus muelleri Miller, Semiacontiodus sp. and Teridontus nakamurai Nogami, which are characteristic of the Cordylodus angulatus Zone (upper lower Tremadocian). In the Iruya area, the C. angulatus Zone correlates with the trilobite Kainella meridionalis Zone and the lower part of the Kainella teiichii Zone. Taxonomic diversity and relative frequency of conodont species enables the recognition of the Semiacontiodus-Teridontus community, which is characteristic of shallow marine environments. Keywords: Conodonts, Tremadocian, Santa Rosita Formation, Iruya, Argentina.