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The paper describes the brachiopod fauna recovered from the outer-ramp deposits developed …


Biology Articles » Paleobiology » Paleoecology » An outer-ramp brachiopod assemblage from the uppermost San Juan Formation (middle Arenig), northern Argentine Precordillera: paleoecologic and biogeographic implications » Figures

Figures
- An outer-ramp brachiopod assemblage from the uppermost San Juan Formation (middle Arenig), northern Argentine Precordillera: paleoecologic and biogeographic implications

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Figure 1. Geological map of the Guandacol-Gualcamayo region (from Astini, 1998) showing fossiliferous localities (asterisks) and columnar section of the upper part of the San Juan Formation and lower part of the Gualcamayo Formation (modified from Cañas, 1999) / mapa geológico de la región de Guandacol-Gualcamayo (de Astini, 1998) indicando las localidades fosilíferas (asteriscos) y columna estratigráfica de la parte superior de la Formación San Juan e inferior de la Formación Gualcamayo (modificado de Cañas, 1999).

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Figure 2. Pie diagrams showing percentages of outer-ramp assemblage from Quebrada Potrerillos section, northern Precordillera. A, genera; B, guilds / diagrama en mosaico con los porcentajes relativos de la asociación de rampo externa en la Quebrada Potrerillos, Precordillera norte. A, composición de géneros; B, composición de los grupos funcionales.

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Figure 3. Pie diagrams showing percentages of mid-ramp assemblages from the Niquivil section, central Precordillera, A, genera, B, guilds / diagrama en mosaico con los porcentajes relativos de las asociaciones de rampa media del área de Niquivil (Precordillera central). A, composición de géneros, B, composición de los grupos funcionales.

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Figure 4. Schematic paleogeographic reconstrucction showing inferred relationships between the proto-Andean margin of Gondwana and the Precordillera terrane (PT) in the Llanvirn (from Benedetto, 2004) / reconstrucción paleogeográfica esquemática mostrando las relaciones entre el margen proto-Andino de Gondwana y el terreno Precordillera (PT) en el Llanvirniano (de Benedetto, 2004).

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Figure 5. A-K. Archaeorthis sp. A, B, exterior and interior of dorsal valve / exterior e interior de valva dorsal CEGH-UNC 21801, X3; C, D, exterior and interior of ventral valve / exterior e interior de valva ventral CEGH-UNC 21804, X4; E, F, exterior and interior of dorsal valve / exterior e interior de valva dorsal CEGH-UNC 21803, X5,5; G, interior of dorsal valve / interior de valva dorsal CEGH-UNC 21805, X6; H, exterior of incomplete ventral valve / exterior de una valva ventral incompleta CEGH-UNC X3,5. I, J, internal mold and latex replica of dorsal valve / molde interno y réplica de caucho de valva dorsal CEGH-UNC 21806, x3,75; K, internal mold of dorsal valve / molde interno de valva dorsal CEGH-UNC 21832, x4,5. L-W. Orthidium guandacolensis n. sp. L, external mold of ventral valve / molde externo de valva ventral , CEGH-UNC 21820, X6,5; M, N, exterior and interior of ventral valve / exterior e interior de valva ventral CEGH-UNC 21812, X6,5; O, P, exterior and interior of dorsal valve / exterior e interior de valva dorsal CEGH-UNC 21812, X8,5; Q, R, exterior and interior of ventral valve / exterior e interior de valva ventral CEGH-UNC 21813, X6; S, interior of dorsal valve, holotype / interior de valva dorsal, holotipo CEGH-UNC 21811, X6; T, internal mold of ventral valve / molde interno de valva ventral CEGH-UNC 21822, X5; U, internal mold of ventral valve / molde interno de valva ventral CEGH-UNC 21831, X4,5; V, internal mold of dorsal valve / molde interno de valva dorsal CEGHUNC 21821, X7,5; W, internal mold of dorsal valve / molde interno de valva dorsal CEGH-UNC 21825, X10. X, Ffynnonia sp., exterior of dorsal valve / exterior de valva dorsal CEGH-UNC 21820, X4,5.

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Figure 6. A-J, Taffia ( Chaloupskia ) minima n. sp. A, ventral valve exterior / exterior de valva ventral CEGH-UNC 21775, X7; B, dorsal valve exterior / exterior de valva dorsal CEGH-UNC 21809, X12; C, internal mold of ventral valve / molde interno de valva ventral CEGHUNC 21786, X6; D, E, exterior and interior of ventral valve / exterior e interior de valva ventral CEGH-UNC 21777, X4,5; F, G, exterior and interior of dorsal valve, holotype / exterior e interior de valva dorsal, holotipo CEGH-UNC 21774, X7; H, internal mold of dorsal valve / molde interno de valva dorsal CEGH-UNC 21787, X6; I, internal mold of ventral valve / molde interno de valva ventral CEGH-UNC 21808, X6; J, exterior and interior of dorsal valve / exterior e interior de valva dorsal CEGH-UNC 21783, X7. K-S, Leptella ( Petroria ) ventrocristata n. sp., K, latex cast of ventral valve exterior / molde del exterior de valva ventral CEGH-UNC 21833, X4; L, interior of ventral valve, holotype / interior de valva ventral, holotipo CEGH-UNC 21798, X4; M, internal mold of dorsal valve / molde interno de valva dorsal CEGHUNC 218830, X3; N, internal mold of ventral valve / molde interno de valva ventral CEGH-UNC 21807, X4,5; O, internal mold of ventral valve / molde interno de valva ventral CEGH-UNC 21797, X4; P, Q, exterior and interior of dorsal valve / exterior e interior de valva dorsal CEGH-UNC 21791, X3,5; R, S, dorsal and ventral views of conjoined specimen / vista dorsal y ventral de un ejemplar con valvas articuladas CEGH-UNC 21795, X4. T-Y, Tritoechia ( Tritoechia ) sp., T, U, exterior and interior of dorsal valve / exterior e interior de valva dorsal CEGH-UNC 21834, X2,5; V, W, exterior and interior of ventral valve / exterior e interior de valva ventral CEGH-UNC 21835, X2,5; X, internal mold of ventral valve / molde interno de valva ventral CEGH-UNC 21841, X4; Y, exterior and interior of dorsal valve / e xterior e interior de valva dorsal CEGH-UNC 21837, X3. Z-Z2, Pelonomia ? sp. Z, external mold of dorsal valve / molde externo de valva dorsal CEGHUNC 21859, X4; Z1, Z2, internal mold of dorsal valve and latex cast / molde interno de valva dorsal y réplica de caucho CEGH-UNC 21860, X3,5.

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