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.
Highlights
The Cordillera Oriental, northwestern Argentina (Fig. 1A and B) is characterized by large thrust belts of lower Paleozoic rocks that include late Furongianlate Tremadocian highly fossiliferous sandstone and shale of the Santa Rosita Formation (Turner, 1960) (Fig. 1C)
A conodont assemblage recovered from the middle part of the Santa Rosita Formation at Pantipampa (Iruya area, northwestern Argentina) is described
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
Summary
The Cordillera Oriental, northwestern Argentina (Fig. 1A and B) is characterized by large thrust belts of lower Paleozoic rocks that include late Furongianlate Tremadocian highly fossiliferous sandstone and shale of the Santa Rosita Formation (Turner, 1960) (Fig. 1C). Well-constrained Tremadocian fossil sites include the Santa Victoria, Nazareno, El Perchel, Tilcara and Purmamarca areas (Fig. 1B). Tortello and Esteban (2016) recently described a Tremadocian succession from the Pantipampa locality (Iruya area, Salta Province). The aims of this paper are to describe in detail the conodont faunas from the Santa Rosita Formation at Pantipampa, and to refine the age assignment and correlations with other Lower Ordovician localities from the Cordillera Oriental and the world
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