NEW PALEOCENE RHYNCHONELLIDE BRACHIOPODS FROM THE POTRERILLOS FORMATION, NORTHEAST MEXICO

2007 ◽  
Vol 81 (3) ◽  
pp. 483-489 ◽  
Author(s):  
SUSAN L. KLOSTERMAN ◽  
MICHAEL R. SANDY ◽  
FRANCISCO J. VEGA ◽  
KATHERINE A. GILES ◽  
KYLE GRAF ◽  
...  
Keyword(s):  
Potrerillos Formation

On some Paleocene invertebrates from the Potrerillos Formation (Difunta Group), northeastern Mexico

1995 ◽  
Vol 69 (5) ◽  
pp. 862-869 ◽  
Author(s):  
Francisco J. Vega ◽  
Maria Del Carmen Perrilliat
Keyword(s):  
Tidal Flat ◽  
Sedimentary Basins ◽  
Depositional Environments ◽  
Northeastern Mexico ◽  
Potrerillos Formation ◽  
First Time

Three species of mollusks and one annelid are described from the Paleocene upper mudstone member of the Potrerillos Formation (La Popa Basin), and from the upper part of the Rancho Nuevo Formation (Parras Basin). The species described include a gastropod, a bivalve, a nautiloid and a serpulid worm, which are formally reported for first time as Paleocene fauna of the Difunta Group in northeastern Mexico. The nautiloid species provides the basis for correlation between the two sedimentary basins of the Difunta Group, as it is reported for Paleocene layers of the two formations studied. Shoreface and tidal-flat depositional environments are inferred for the Paleocene rocks of the Difunta Group.

scholarly journals New species of osmundaceous fertile leaves from the upper Triassic of Argentina

2018 ◽  
Vol 58 (2) ◽  
pp. 107-119 ◽  
Author(s):  
Eliana P. Coturel ◽  
Josefina Bodnar ◽  
Eduardo M. Morel ◽  
Daniel G. Ganuza ◽  
Ana J. Sagasti ◽  
...  
Keyword(s):  
New Species ◽  
First Record ◽  
Late Triassic ◽  
Apical Region ◽  
New Taxon ◽  
Potrerillos Formation ◽  
Formed Part ◽  
Entire Margin ◽  
Early Late ◽  
A New Species

AbstractA new species of Osmundopsis Harris is described based on several impression-compression fossils from the upper section of the Potrerillos Formation (Uspallata Group) at Cerro Cacheuta Hill, Mendoza Province, Argentina. Osmundopsis zunigai sp. nov. is characterized by having fertile pinnae with a slender striate rachis, bearing widely separate, opposite to subopposite short falcate pinnules with an entire margin, rounded apex, and a partially reduced lamina. The pinnules bear sporangia loosely disposed in clusters of four or five on the abaxial side. The sporangia are wedge- to heart-shaped, shortly stalked, with cells of the apical region thickened, and have a vertical dehiscence slit. The spores are trilete and laevigate. This is the first record of Osmundopsis in the Triassic of Argentina. The mutual occurrence or co-preservation of Osmundopsis zunigai sp. nov. with sterile fronds of Cladophlebis kurtzi suggests the possibility that these species formed part of a dimorphic bipinnate frond. The diversity and geographic extent of fertile leaves of the Osmunda lineage in the early Late Triassic, with records in South Africa and Antarctica and now with this new taxon, support the idea of a moist mesothermal climatic belt in southern Gondwana.

The enigmatic arthropod Duraznovis gallegoi from the Late Triassic of Argentina is a cicadomorphan head (Insecta: Hemiptera: Auchenorrhyncha)

2020 ◽  
Vol 3 (3) ◽  
pp. 245-247 ◽  
Author(s):  
YANZHE FU ◽  
DIYING HUANG
Keyword(s):  
Systematic Position ◽  
Upper Triassic ◽  
Late Triassic ◽  
Fossil Taxon ◽  
Potrerillos Formation

Recently, Lara et al. (2020a, b) described a new fossil taxon, Duraznovis gallegoi, based on two specimens from the Upper Triassic Potrerillos Formation at Quebrada del Durazno, Cuyana Basin of Argentina. This fossil is considered to be an enigmatic arthropod closely resembling the living and fossil representatives of xiphosurans (Chelicerata) and notostracans (Branchiopoda), two completely different arthropod groups with convergent body plans. Some distinctive combination of features, however, makes the systematic position of these specimens indeterminate (Lara et al., 2020a, b).

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