Eduardo Morel

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Las colecciones de la División Paleobotánica, Facultad de Ciencias Naturales y Museo, La Plata, Buenos Aires, Argentina

Boletín de la Asociación Latinoamericana de Paleobotánica y Palinología, May 1, 2015

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Primitive Vascular Plants and Microfossils from the Río Seco de los Castaños Formation, San Rafael Block, Mendoza Province, Argentina

Pre-carboniferous Evolution of the San Rafael Block, Argentina, 2017

In this contribution we describe fossil plant remains from Río Seco de los Castaños Formation, at... more In this contribution we describe fossil plant remains from Río Seco de los Castaños Formation, at San Rafael Block, Mendoza Province, Argentina. The fossil plants comprise non-forked and forked axes without or with delicate lateral expansions, which are assigned to Bowerophylloides cf. mendozaensis and Hostinella sp. We refer them to primitive land plants and discuss about their systematic affiliation. Furthermore, we mention the presence of a diverse acritarch assemblage present in the same lithostratigraphic unit. On the basis of the taxonomical information and stratigraphic correlation, we could infer that Río Seco de

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Sedimentology, palaeobotany and geochronology of the Piedra del Aguila Formation (Lower Jurassic, Neuquen) [Consideraciones acerca de la sedimentologia, paleobotanica y geocronologia de la Formacion Piedra del Aguila (Jurasico Inferior, Neuquan)]

Evidencias Sobre La Edad Triasica De La Formacion Lapa en La Region De Chacaico, Provincia Del Neuquen

Se describe la Formacion Lapa en su area tipo y se da a conocer el hallazgo de Telemachus elongat... more Se describe la Formacion Lapa en su area tipo y se da a conocer el hallazgo de Telemachus elongatisAnderson, 1978 y Pagiophyllum sp. en sus niveles mas altos. La Mora fosil permite asignar la unidad al Triasicotardio y correlacionarla con la Formacion Paso Flores. El relleno inicial de la Cuenca Neuquina esta caracterizadopor facies fluviales proximales sintectonicas, las que en el area de acumulacion de la Formacion Lapa estan acompanadaspor fenomenos volcanicos explosivos representados esencialmente por depositos de Mujo y de caida.

El Triásico De La Formación Carrizal en El Depocentro De Marayes (San Juan, Argentina): Paleobotánica, Tafonomía y Bioestratigrafía

In this contribution, we studied the fossil plants preserved as impressions-compressions fromCarr... more In this contribution, we studied the fossil plants preserved as impressions-compressions fromCarrizal Formation (Triassic), Marayes depocenter, San Juan, Argentina. The recognized taxacorrespond to Equisetales (Equisetites fertilis (Frenguelli) Frenguelli, Neocalamites carrerrei(Zeiller) Halle), Osmundales (Cladophlebis kurtzi Frenguelli, C. mesozoica (Kurtz)2Frenguelli), Corystospermales (Dicroidium lancifolium (Morris) Gothan, D. odontopteroides(Morris) Gothan, Peltaspermales (Scytophyllum cf. argentinum), Cycadales (Kurtzianabrandmayri Frenguelli, K. cacheutensis (Kurtz) Frenguelli), Ginkgoales (Ginkgoitesmatatiensis), Voltziales (Heidiphyllum elongatum (Morris) Retallack), Gnetales (Yabeiellabrackebuschiana (Kurtz) Oishi). Furthermore, we realized a stratigraphic arrangement of thefossil plant record, describing three fossiliferous levels, one belonging to Arroyo SecoMember (lower) and two corresponding to Rickard Member (upper). In the bed-loaddominated fluvial deposits of Arro...

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Procesos de continentalización en el Devonico de la precordillera

The Devonian Punta Negra Formation is made up of a 1.700 m thick turbidite succession. Recent inv... more The Devonian Punta Negra Formation is made up of a 1.700 m thick turbidite succession. Recent investigations carried out in the Precordillera of San Juan (Bachongo area) have shown that the upper levels of this Formation grade upwards to red shales and sandstones. Correlatively, it was observed an increase in the grain size and the appearence of trough cross-bedded strata. This red unit, 65-70 m thick, has be en interpreted as a progradational de1taic sequence formed during a period of low-stand sea-leve!. Analysis of the detrital modes in this de1taic unit shows the predominance of quartz-feldespathic sandstones, probably derived from intracratonic blocks. It is considered that this sequence represents the first gondwanic continentalization event in the Precordillera region. The sedimentary column is bounded at the top by an unconformity upon wluch lies the basal conglomerate of the continental Carboniferous sequence (Andapaico Formation).

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Middle Triassic dipterid ferns from west-central Argentina and their relation to palaeoclimatic changes

Acta Palaeontologica Polonica, 2018

Dipterid ferns possess robust fossil record from Mesozoic times on, and they are considered to be... more Dipterid ferns possess robust fossil record from Mesozoic times on, and they are considered to be a reliable indicator of warm to subtropical humid or seasonal paleoclimatic conditions. In this contribution, we revised and described new samples of fossil Dipteridaceae, from the Barreal and Cortaderita formations (Sorocayense Group), Middle Triassic (Anisian-Ladinian), central-western Argentina. We found out that three species of Dictyophyllum, one of Hausmannia, and one of Thaumatopteris are present in the Sorocayense Group. We erected a new species Dictyophyllum menendezi sp. nov., which is characterized by petiolate fan-shaped fronds, rachis dividing into two arms, each one bearing 5 or 6 oblanceolate pinnae, basal lamina of adjacent pinnae fused forming a wide web, pinnae margin entire to undulate, primary veins catadromous to isodromous, secondary veins subopposite, tertiary veins subopposite to alternate, falcate or with a zigzag pattern, dichotomizing four times to form a fine reticulate mesh of polygonal irregular areoles. Temporal changes in the diversity of Dipteridaceae were identified in Sorocayense Group. The first record and the maximum species richness occur at the top of the Barreal Formation (late Anisian) with three species. The lower member of the Cortaderita Formation (early Ladinian) presents two species. Dipteridaceae fossils are not registered in the upper member of the Cortaderita Formation (late Ladinian). An important diversification pulse of the family is registered during the late Norian-Rhaetian in other areas of Argentina (Paso Flores, Malargüe, and Atuel depocenters). The flourishing of Dipteridaceae during the late Anisian-early Ladinian and the late Norian-Rhaetian could be related to the increasing humidity episodes of the subtropical seasonal climate that prevailed during the Triassic. Furthermore, Dipteridaceae appear important in the establishment of plant communities, being part of early stages of floristic succession.

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

Acta Palaeobotanica, 2018

A new species of Osmundopsis Harris is described based on several impression-compression fossils ... more A 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 bipinn...

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Paleofloras y Sedimentologiía De Una Sucesión Lacustre-Fluvial Del Triásico Tardío: La Formación Paso Flores en Cañadón De Pancho, Neuquén, Argentina

Ameghiniana, Feb 1, 2014

Consideraciones acerca de la sedimentología, paleobotánica y geocronología de la formación piedra del águila (jurásico inferior, Neuquén)

Revista De La Asociacion Geologica Argentina, May 1, 2010

En su localidad tipo, la Formación Piedra del Águila se compone de una sucesión homoclinal de 71,... more En su localidad tipo, la Formación Piedra del Águila se compone de una sucesión homoclinal de 71,6 m de espesor que yace sobre una paleosuperficie de meteorización desarrollada sobre el basamento ígneo-metamórfico (Formación Mamil Choique) y es sucedida en discordancia angular por rocas volcánicas y volcaniclásticas del Jurásico Inferior correspondientes a la Formación Sañicó. En la Formación Piedra del Águila predominan las pelitas (lutitas, fangolitas y limolitas), entre las que intercalan areniscas muy gruesas y gruesas, areniscas conglomerádicas y conglomerados finos, en cuerpos espesos (1 a 3 m) de geometría lenticular o como capas tabulares y lenticulares más delgadas (0,2 m a 0,4 m). Las areniscas son feldarenitas, compuestas esencialmente por clastos de cuarzo y feldespato potásico que provienen de la desintegración de rocas del basamento local. Los depósitos estudiados se asignan a un ambiente fluvial de carga mixta compuesto por dos sistemas de acumulación: planicie de inundación y relleno de canales avulsivos. En la Formación Piedra del Águila se ha determinado la existencia de una flora fósil de baja diversidad constituida por once taxones. Dos se identifican por primera vez en la Argentina (O. groeberi y O. oldhami, siendo este último característico del Liásico de la India), uno se registra en el Triásico-Jurásico temprano (Cladophlebis indica) y otros dos son característicos del Liásico (Scleropteris sp. y Otozamites bechei). Los restantes poseen un amplio biocrón (Equisetites sp., Sphenopteris sp., Cladophlebis sp., C. hairburnensis, Otozamites hislopi y Ptilophyllum acutifolium). En la sucesión se identifica un nivel de toba vítrea chalazolítica de 0,5 m de espesor. Esta piroclastita posee granos de circón euhedrales con terminaciones bipiramidales que han servido para efectuar una datación U-Pb SHRIMP. Los resultados indican una edad de cristalización magmática de 191,7 ± 2,8 Ma, correspondiente al Sinemuriano.

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Sedimentology, palaeobotany and geochronology of the Piedra del Águila Formation (Lower Jurassic, Neuquén)

Revista De La Asociacion Geologica Argentina, May 1, 2010

Artabe, A.E.; Morel, E.M. y Zamuner, A.B., 1994. Estudio Paleobotánico y Tafonómico de la Formación Paso Flores (Triásico superior), en el Cañadón de Pancho, Provincia del Neuquén. Argentina. Ameghiniana 31 (2): 153-160. ISSN: 0002-7014

AMEGHINIANA

Spalletti, L.A., Artabe, A.E., Morel, E.M. y Brea, M., 1999. Biozonación Paleoflorística y cronoestratigrafía del Triásico argentino. Ameghiniana 36 (4): 419-451. ISSN: 0002-7014

AMEGHINIANA

Morel, E.M.; Artabe, A.E.; Ganuza, D. y Brea, M., 1993. Las plantas fósiles de la Formación Monte Flora, en Bahía Botánica, Península Antártica, Argentina. I. Dipteridaceae. Ameghiniana 30 (4): 1-9. ISSN: 0002-7014

AMEGHINIANA

Artabe, A.E., Morel, E.M., Spalletti, L.A. y Brea, M., 1999. Paleoambientes sedimentarios y Paleoflora asociada en el Triásico superior de Malargüe (Sur de Mendoza, Argentina). Revista de la Asociación Geológica Argentina 53 (4): 526-548. ISSN 0004-4822

Revista de la Asociacion Geologica Argentina

Megafloras Mesozoicas

Depositional environments of Devonian land plants from the Argentine Precordillera, South-West Gondwana

Primitive Herbaceous Lychophytes Record at the Rio Seco De Los Castaños Formation, San Rafael Block, Mendoza Province, Argentina

The San Rafael or Sierra Pintada Block is situated at the central-western of the Mendoza province... more The San Rafael or Sierra Pintada Block is situated at the central-western of the Mendoza province and shows diverse igneous, metamorphic and sedimentary units of Mesoproterozoic to Paleozoic age, known generally as 'pre-Carboniferous' due to they are clearly separated by a regional unconformity. One of these units is the Río Seco de los Castaños Formation (González Díaz, 1972; 1981) that was initially considered as a part of the La Horqueta low-grade methamorphic 'Serie' (Dessanti, 1956) and was later distinguished because of its marine sedimentary characteristics and assigned to the Devonian because of a coral record (Pleurodyctium) carried out by Di Persia (1972). In other contributions, Nuñez (1976) and Criado Roque and Ibañez (1979) have described several sedimentary and structural features of this unit. Later works (Poiré et al., 2002 and Manassero et al., 2005, for example), have recognized trace fossils associations in the Agua del Blanco locality, improving t...

El Registro De Lycophytas Primitivas en La Formación Rio Seco De Los Castaños, Bloque De San Rafael, Mendoza

Dentro del denominado " pre-Carbonífero " del Bloque de San Rafael, Mendoza, se encuent... more Dentro del denominado " pre-Carbonífero " del Bloque de San Rafael, Mendoza, se encuentra la Formación Río Seco de los Castaños (RSC) que fuera instituída por González Díaz (1972, 1981) separándola de la Formación La Horqueta (Dessanti, 1956). Fue asignada tentativamente al Devónico por la presencia de un coral (Pleurodyctium) hallado por Di Persia (1972). Esta unidad RSC tiene sus afloramientos principales en el Cañón del Atuel, ruta 144-Loma Rodeo Bordalesa, Lomitas Negras y Agua del Blanco (Nuñez, 1976). En recientes trabajos de campo, se han registrado en niveles correspondientes al desarrollo de paleoambientes plataformales y deltaicos de la RSC que alcanza 600 m de espesor, fragmentos de primitivas plantas, en el perfil correspondiente a la sección tipo expuesta en el Cañón del Río Atuel. Se trata de improntas de delicados tallos, el mayor de los cuales tiene 11,5 mm de largo y 0,57 mm de ancho. Se disponen de manera helicoidal enaciones de 5 mm de largo, probablemen...

Voltziales y Pinales (= Coniferales) de la Formación Cortaderita (Triásico Medio), Argentina, y su implicancia en la reconstrucción de las coníferas triásicas

Revista Brasileira de Paleontologia, 2015

, leaves, and branches designated to the subclass Pinidae (Voltziales and Pinales) are described ... more , leaves, and branches designated to the subclass Pinidae (Voltziales and Pinales) are described from Cortaderita Formation (Middle Triassic). Fossil materials were collected at Cortaderita and La Tinta creeks, at Barreal area from Barreal-Calingasta basin, Pre-Andean region of San Juan, Argentina. Leaves corresponding to three species of Heidiphyllum (order Voltziales), leafy twigs assigned to Elatocladus planus (Pinales) and permineralized trunks and branches ascribed to Cupressinoxylon zamunerae sp. nov. (Pinales), were recognized. The last two species exhibit characters that allow designating them to family Cupressaceae sensu lato. At the same time, it is demonstrated that they belong to the same plant, which is named as the new species of Cupressinoxylon here described. This reconstruction is based on kindred reinforcement and mutual occurrence criteria, besides morphological and anatomical characters. Thus, Cupressinoxylon zamunerae sp. nov. is interpreted as a tree 13 m tall, highly branched, with penultimate order shoots with scale-like leaves and last order shoots with alternate, sessile, single-veined, linear to acicular leaves distributed helically. These records confi rm the presence of Cupressaceae sensu lato since the Triassic in Gondwana.

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