Páginas 853-857.

5 páginas

Páginas 67-71.

Páginas 38-42.

pp. 147–160

Trabajo presentado en Simposio ICGP 591 ‘The Early to Middle Palaeozoic Revolution’, Closing Meeting Abstract, Ghent University, Belgium, 6-9 july 2016.

Páginas 155-159.

5 páginas

[ENG] Epipelagic telephinid trilobites rarely occur in the Ordovician of South America, being represented by few specimens recorded from the Argentinian Precordillera, the Famatina Basin, eastern Puna and Cordillera Oriental. We here report the northernmost occurrences of the genera Carolinites and Oopsites in the Central Andean Basin, coming from the Lower Ordovician rocks of the Sella Formation of southern Bolivia (Carolinites genacinaca Ross s.l.) and from the San José Formation of southwestern Peru (Oopsites sp. nov). The scarce record of these telephinids has been related to warm water currents, that sporadically moving southwards along the Gondwanan margin, carrying palaeotropical trilobites into more temperate to cool‐water higher palaeolatitudes.

The cases of Joan Corbacho from Spain, and Klaus Hönninger and Carlos A. Vildoso from Peru, considered by some as prestig-ious paleontologists in their countries, are discussed here. The first one is a fossil collector and trader that, without a minimal scientific knowledge, published ca. 20 papers with proposals for a dozen new trilobite taxa coming from different Paleozoic for-mations in the Moroccan Anti-Atlas. Descriptions of new taxa seem formally valid but are rather inadequate, often based on poorly preserved material of dubious geological provenance, and mostly published as papers without peer review in a local jour-nal, managed by a private museum connected to the Seminary of Barcelona. Besides this, part of the published and figured tri-lobite specimens were later offered for sale in the internet, sometimes accompanied with a ‘certificate of authenticity’ signed by the Mus...

La comunicación anticipa el descubrimiento del fósil articulado de un organismo vermiforme procedente del Ordovícico del Perú Central, como primer hallazgo en el Paleozoico peruano. Constituye, así mismo el segundo registro de fósiles de cuerpo blando a nivel de Sudamérica, tras los dos ejemplares incompletos descritos en 2005 por García-Bellido y Aceñolaza para el Cámbrico terminal Noroeste argentino. El fósil hallado procede una unidad de lutitas oscuras graptolíticas, localizada en la vertiente Noroccidental del cerro Huamcampa, al Noroeste de Huayre (Junín, Cuadrángulo de Ulcumayo). Se brinda la descripción morfológica que semeja una estructura anular con ornamentación radial y se esboza una identificación.

Lower–Middle Ordovician brachiopods are well known from the Central Andean Basin of Argentina and Bolivia, but relatively little data comes from its northern prolongation in the Altiplano and the Eastern Cordillera of Peru. Here we present information about brachiopods collected from the San José Formation (Fm) from several sections located at the northeast of the Apurímac River valley in the surroundings of Kimbiri city in the Eastern Cordillera. From northwest to southeast the sections and their locations are: Libertad, in the mountain trail between this hamlet and the city of Pichari; Catarata and Nueva Alianza, in the mountain trail between Oroya and the last hamlet; and Kimbiri (K), in the trail parallel to the Kashiroveni stream north of the village of Kimbiri Alto. In these localities the San José Fm lies unconformably on Neoproterozoic rocks, reaching the maximum thickness o...

[ENG] New Floian and early middle Darriwilian brachiopod assemblages of the San José Formation of the Eastern Cordillera of Peru are presented. A new genus and species, Apurimella santiagoi, and two new species, Phragmorthis henrylunae and Nocturnellia ashaninka, are described. The assemblages also contain additional characteristic taxa demonstrating links with other proto-Andean localities (Peruvian Altiplano, Argentinian Eastern Cordillera, Famatina) as well as with some localities of Baltica (Estonia, Ingria, Norway), Ganderia (Anglesey, Tramore, Indian Bay, Summerford, Miramichi), peri-Laurentia (Mayo, Svalbard) and Laurentia (Klamath Mountains). Those shared genera indicate dynamic faunal exchanges between the Peruvian Eastern Cordillera and these terranes during the Early–Middle Ordovician transition, suggesting active brachiopod dispersal mechanisms across the Rheic and Iapetus...

Fossil remains of extinct relatives of cephalopods are known to occur in Peruvian strata of Ordovician age (~485–444 million years old) for a long time. However, they remain poorly known today. Here, we describe for the first time specimens that were collected from strata of the San José Formation of the Kimbiri and Inambari areas, southeastern Peru. The assemblage contains five species; one of them, Bactroceras cocafolium, is new to science. One other species is known from strata of the same age from elsewhere in the central Andes. The five species also show a relationship with cephalopod assemblages known from the old continents Gondwana and Avalonia.

4 páginas.

En el Perú central, específicamente en el Cuadrángulo de Ulcumayo (22-l) ubicado en el departamento de Junín, las rocas más antiguas han sido atribuidas al Complejo Maraynioc (Monge, et.al., 1996), asumiendo tiempos del Precámbrico. Sin embargo, estudios sedimentológicos y estratigráficos ponen en evidencia la presencia de graptolitos del Ordovícico de afinidades anglo-galesas (Fig.1). De esta manera se presenta un sumario con las identificaciones taxonómicas preliminares y su aplicación bioestratigráfica. Por otro lado, se atiende parte de la problemática litoestratigráfica, pues al consultar las publicaciones quedaba claro una necesaria revisión del topónimo y de las unidades establecidas, en vista que las definiciones y cambios de rango resultaron ser arbitrarios y sin mayor significado estratigráfico. En este sentido, una revisión de la Terminología y Nomenclatura ...

4 páginas.

En el presente trabajo se pasa revista a los hallazgos precedentes, y se avanza el descubrimiento de dos nuevas localidades con conodontos en el Ordovícico peruano. Hasta la fecha y desde el punto de vista estratigráfico, todos los yacimientos se ubican en la mitad inferior de la Formación San José (Floiense a Sandbiense) de la Cordillera Oriental, encontrándose en tratamiento muestras de nódulos calcáreos de la Formación Calapuja del Altiplano, que potencialmente vendrían a sumar los primeros datos sobre estos microfósiles en el Ordovícico Superior peruano.

Ordovician conodont faunas are poorly known from the northern part of the Central Andean Basin, in contrast with data from the northwest of Argentina and south of Bolivia, areas located in the southern part of the same basin. A single occurrence of late Floian conodonts of the upper Oepikodus evae Zone was reported in 2008 from the Carcel Puncco section (Inambari River valley) of southwestern Peru, close to the Subandean Fault. Further research in the Eastern Cordillera of Peru led to the discovery of three additional occurrences of Early to Middle Ordovician conodonts, also in the San José Formation but representative of different horizons. The first of them consists of an assemblage belonging to the Trapezognathus diprion–Baltoniodus cf. triangularis zones (late Floian), and was characterised in the Kimbiri section (Apurímac River valley). The remaining Abra de Yanacocha and Huanca...

Páginas 249-252.