INDEX OF AMEGHINIANA, VOLUMES I TO XX. - Every item contained in the first 20 volumes of Ameghini... more INDEX OF AMEGHINIANA, VOLUMES I TO XX. - Every item contained in the first 20 volumes of Ameghiniana has been indexed by author and subject. a) The author index includes not only published papers but also titles of papers read at the meetings of the Argentine Palaeontological Association, obituaries, book-reviews, etc. It is alphabetically arranged by authors(s). Whenever there is more than one paper by the same author(s) a sequence number has been added chronologically at the end, to avoid ambiguities when cross-referencing the second part. Compound surnames and maiden/married-surnames are given double entry. b) The subject index is also alphabetically arranged by hierarchical headings and subheadings and was compiled taking into consideration the contents of each paper and not only the titles. It includes systematic, stratigraphic and geographic items. The references are given using the author's names and numbers as stated in the author index. A list of the available publication dates for each issue of Ameghiniana is also provided.
... An area with mixed bivalve faunas is present in central Argentina and Chile. Further north (n... more ... An area with mixed bivalve faunas is present in central Argentina and Chile. Further north (northern Chile and Peru) there are very few (if any) Austral elements and the Tethyan influence is more evident. The regional biostratigraphical ...
The Pliensbachian–Toarcian boundary interval is characterized by a ~ 3‰ negative carbon-isotope e... more The Pliensbachian–Toarcian boundary interval is characterized by a ~ 3‰ negative carbon-isotope excursion (CIE) in organic and inorganic marine and terrestrial archives from sections in Europe, such as Peniche (Portugal) and Hawsker Bottoms, Yorkshire (UK). A new high-resolution organic-carbon isotope record, illustrating the same chemostratigraphic feature, is presented from the Southern Hemisphere Arroyo Chacay Melehue section, Chos Malal, Argentina, corroborating the global significance of this disturbance to the carbon cycle. The negative carbon-isotope excursion, mercury and organic-matter enrichment are accompanied by high-resolution ammonite and nannofossil biostratigraphy together with U–Pb CA-ID-TIMS geochronology derived from intercalated volcanic ash beds. A new age of ~ 183.73 + 0.35/− 0.50 Ma for the Pliensbachian–Toarcian boundary, and 182.77 + 0.11/− 0.15 for the tenuicostatum–serpentinum zonal boundary, is assigned based on high-precision U–Pb zircon geochronology an...
Trochotomidae is a small but distinctive extinct family of pleurotomarioidean gastropods characte... more Trochotomidae is a small but distinctive extinct family of pleurotomarioidean gastropods characterized by trochiform shells with an elliptical trema. Two new species of trochotomids are described from Pliensbachian deposits in the Neuquén Basin, Argentina. The new genus-group name Placotoma is proposed to replace the pre-occupied name Discotoma Haber non Mulsant. The record of Trochotoma (Trochotoma) protonotialis new species and Trochotoma (Placotoma) neuquensis new species in the early Jurassic of Argentina extends the paleobiogeographical distribution of the genus (and the family) to the Southern Hemisphere. The new taxa reported here represent a component of the pleurotomarioidean adaptive radiation that took place in the Tethyan region during the earliest Jurassic. They are related to local patch coral reefs of shallow, open-marine paleoenvironments, agreeing with the known habitat of most species of this family. The group was well represented in the Tethyan region during the Mesozoic, especially during the Jurassic, and the new species represent its southernmost occurrence
The Pliensbachian–Toarcian boundary interval is characterized by a ~3‰ negative carbon-isotope ex... more The Pliensbachian–Toarcian boundary interval is characterized by a ~3‰ negative carbon-isotope excursion (CIE) in organic and inorganic marine and terrestrial archives from sections in Europe, such as Peniche (Portugal) and Hawsker Bottoms, Yorkshire (UK). A new high-resolution organic-carbon isotope record, illustrating the same chemostratigraphic feature, is presented from the Southern Hemisphere Arroyo Chacay Melehue section, Chos Malal, Argentina, corroborating the global significance of this disturbance to the carbon cycle. The negative carbon-isotope excursion, mercury and organic-matter enrichment is accompanied by high-resolution ammonite and nannofossil biostratigraphy together with U-Pb CA-ID-TIMS geochronology derived from intercalated volcanic ash beds. A new age of ~183.71 ± 0.40/-0.51 Ma for the Pliensbachian–Toarcian boundary, and 182.77 +0.11/-0.21 for the tenuicostatum–serpentinum zonal boundary, is assigned based on high-precision U-Pb zircon geochronology and a Ba...
Rivista Italiana Di Paleontologia E Stratigrafia, 2004
The Arroyo Malo Formation at Alumbre Creek, on the northern bank of the Atuel River, west central... more The Arroyo Malo Formation at Alumbre Creek, on the northern bank of the Atuel River, west central Argentina, comprises a c. 300 m thick continuous marine succession across the Triassic-Jurassic System boundary, consisting of massive and laminated pelites indicative of a slope depositional environment. Late Triassic invertebrates, including ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals are restricted to the lower 150 m. Beds between 125-135 m from the bottom yield Choristoceras cf . marshi Hauer, a species found in the Marshi/Crickmayi Zone of Europe and North America, together with loose fragments of Psiloceras cf. pressum Hillebrandt, coeval with the lower to middle part of the Hettangian Planorbis Zone. About 80 m higher are beds yielding Psiloceras cf. rectocostatum Hillebrandt, a species that gives name to an Andean biozone partially coeval with the Johnstoni and Plicatulum Subzones, upper Planorbis Zone. Other fossils recorded in the Rhaetian strata of thi...
INDEX OF AMEGHINIANA, VOLUMES I TO XX. - Every item contained in the first 20 volumes of Ameghini... more INDEX OF AMEGHINIANA, VOLUMES I TO XX. - Every item contained in the first 20 volumes of Ameghiniana has been indexed by author and subject. a) The author index includes not only published papers but also titles of papers read at the meetings of the Argentine Palaeontological Association, obituaries, book-reviews, etc. It is alphabetically arranged by authors(s). Whenever there is more than one paper by the same author(s) a sequence number has been added chronologically at the end, to avoid ambiguities when cross-referencing the second part. Compound surnames and maiden/married-surnames are given double entry. b) The subject index is also alphabetically arranged by hierarchical headings and subheadings and was compiled taking into consideration the contents of each paper and not only the titles. It includes systematic, stratigraphic and geographic items. The references are given using the author's names and numbers as stated in the author index. A list of the available publication dates for each issue of Ameghiniana is also provided.
... An area with mixed bivalve faunas is present in central Argentina and Chile. Further north (n... more ... An area with mixed bivalve faunas is present in central Argentina and Chile. Further north (northern Chile and Peru) there are very few (if any) Austral elements and the Tethyan influence is more evident. The regional biostratigraphical ...
The Pliensbachian–Toarcian boundary interval is characterized by a ~ 3‰ negative carbon-isotope e... more The Pliensbachian–Toarcian boundary interval is characterized by a ~ 3‰ negative carbon-isotope excursion (CIE) in organic and inorganic marine and terrestrial archives from sections in Europe, such as Peniche (Portugal) and Hawsker Bottoms, Yorkshire (UK). A new high-resolution organic-carbon isotope record, illustrating the same chemostratigraphic feature, is presented from the Southern Hemisphere Arroyo Chacay Melehue section, Chos Malal, Argentina, corroborating the global significance of this disturbance to the carbon cycle. The negative carbon-isotope excursion, mercury and organic-matter enrichment are accompanied by high-resolution ammonite and nannofossil biostratigraphy together with U–Pb CA-ID-TIMS geochronology derived from intercalated volcanic ash beds. A new age of ~ 183.73 + 0.35/− 0.50 Ma for the Pliensbachian–Toarcian boundary, and 182.77 + 0.11/− 0.15 for the tenuicostatum–serpentinum zonal boundary, is assigned based on high-precision U–Pb zircon geochronology an...
Trochotomidae is a small but distinctive extinct family of pleurotomarioidean gastropods characte... more Trochotomidae is a small but distinctive extinct family of pleurotomarioidean gastropods characterized by trochiform shells with an elliptical trema. Two new species of trochotomids are described from Pliensbachian deposits in the Neuquén Basin, Argentina. The new genus-group name Placotoma is proposed to replace the pre-occupied name Discotoma Haber non Mulsant. The record of Trochotoma (Trochotoma) protonotialis new species and Trochotoma (Placotoma) neuquensis new species in the early Jurassic of Argentina extends the paleobiogeographical distribution of the genus (and the family) to the Southern Hemisphere. The new taxa reported here represent a component of the pleurotomarioidean adaptive radiation that took place in the Tethyan region during the earliest Jurassic. They are related to local patch coral reefs of shallow, open-marine paleoenvironments, agreeing with the known habitat of most species of this family. The group was well represented in the Tethyan region during the Mesozoic, especially during the Jurassic, and the new species represent its southernmost occurrence
The Pliensbachian–Toarcian boundary interval is characterized by a ~3‰ negative carbon-isotope ex... more The Pliensbachian–Toarcian boundary interval is characterized by a ~3‰ negative carbon-isotope excursion (CIE) in organic and inorganic marine and terrestrial archives from sections in Europe, such as Peniche (Portugal) and Hawsker Bottoms, Yorkshire (UK). A new high-resolution organic-carbon isotope record, illustrating the same chemostratigraphic feature, is presented from the Southern Hemisphere Arroyo Chacay Melehue section, Chos Malal, Argentina, corroborating the global significance of this disturbance to the carbon cycle. The negative carbon-isotope excursion, mercury and organic-matter enrichment is accompanied by high-resolution ammonite and nannofossil biostratigraphy together with U-Pb CA-ID-TIMS geochronology derived from intercalated volcanic ash beds. A new age of ~183.71 ± 0.40/-0.51 Ma for the Pliensbachian–Toarcian boundary, and 182.77 +0.11/-0.21 for the tenuicostatum–serpentinum zonal boundary, is assigned based on high-precision U-Pb zircon geochronology and a Ba...
Rivista Italiana Di Paleontologia E Stratigrafia, 2004
The Arroyo Malo Formation at Alumbre Creek, on the northern bank of the Atuel River, west central... more The Arroyo Malo Formation at Alumbre Creek, on the northern bank of the Atuel River, west central Argentina, comprises a c. 300 m thick continuous marine succession across the Triassic-Jurassic System boundary, consisting of massive and laminated pelites indicative of a slope depositional environment. Late Triassic invertebrates, including ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals are restricted to the lower 150 m. Beds between 125-135 m from the bottom yield Choristoceras cf . marshi Hauer, a species found in the Marshi/Crickmayi Zone of Europe and North America, together with loose fragments of Psiloceras cf. pressum Hillebrandt, coeval with the lower to middle part of the Hettangian Planorbis Zone. About 80 m higher are beds yielding Psiloceras cf. rectocostatum Hillebrandt, a species that gives name to an Andean biozone partially coeval with the Johnstoni and Plicatulum Subzones, upper Planorbis Zone. Other fossils recorded in the Rhaetian strata of thi...
Uploads
Papers by Susana Damborenea