The Experts below are selected from a list of 27 Experts worldwide ranked by ideXlab platform
López Martínez Nieves - One of the best experts on this subject based on the ideXlab platform.
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Multiproxy reconstruction of the palaeoclimate and palaeoenvironment of the Middle Miocene Somosaguas site (Madrid, Spain) using herbivore dental enamel
'Elsevier BV', 2009Co-Authors: Domingo Martínez Laura, Cuevas González Jaime, Grimes, Stephen T., Hernández Fernández Manuel, López Martínez NievesAbstract:Profound palaeoclimatic changes took place during the Middle Miocene. The Miocene Climatic Optimum (∼20 to 14–13.5 Ma) was followed by a sudden (∼200 ka) decrease in temperature and an increase in aridity around the world as a consequence of the reestablishment of the ice cap in Antarctica. Somosaguas palaeontological site (Madrid Basin, Spain) has provided a rich record of mammal remains coincident with this global event (Middle Miocene Biozone E, 14.1–13.8 Ma). It contains four fossiliferous levels (T1, T3-1, T3-2 and T3-3, with T1 being the oldest) that span an estimated time of ∼105–125 ka. Scanning Electron Microscope (SEM) and Rare Earth Element (REE) analyses performed on herbivore tooth enamel (Gomphotherium angustidens, Anchitherium cf. A. cursor, Conohyus simorrensis, Prosantorhinus douvillei and ruminants) indicate that diagenetic processes have not been intense enough as to obscure the original geochemical signal. Stable isotope (δ18OCO3, δ13CCO3 and δ18OPO4) analyses have been measured on the herbivore tooth enamel across these levels with the aim of determining to what extent the global cooling and aridity pattern is recorded at this site. A decrease in δ18OCO3 and δ18OPO4 has been detected from T1 to T3-3 and T3-1 to T3-3 respectively indicating a progressive drop of about 6 °C (from around 18 °C to 12 °C) in mean annual temperatures within T3. Tooth enamel δ13C values experience an increase from T3-1 to T3-3 suggesting an increase in aridity. Ba/Ca analyses have also been performed on the tooth enamel in order to detect changes in the palaeoecology of the studied taxa. This ratio allows the establishment of particular feeding patterns such as a more Browsing Habit in the case of Gomphotherium angustidens compared to Anchitherium cf. A. cursor as suggested by higher Ba/Ca values in the latter. Trace elements do not support any significant change across the succession in the dietary behaviour of the species analyzed, despite the stable isotopes evidence of an important palaeoclimatic shift from T1 to T3-3
Lopez-martinez N. - One of the best experts on this subject based on the ideXlab platform.
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Multiproxy reconstruction of the palaeoclimate and palaeoenvironment of the Middle Miocene Somosaguas site (Madrid, Spain) using herbivore dental enamel
'Elsevier BV', 2009Co-Authors: Domingo Laura, Cuevas González Jaime, Grimes, Stephen T., Hernández Fernández M., Lopez-martinez N.Abstract:16 pages, 11 figures, 3 tables.-- Available online Nov 17, 2008.-- This work is a contribution from the research groups UCM-CAM 910161 on Geologic Record of Critical Periods: Palaeoclimatic and Palaeonvironmental Factors, and UCM-CAM 910607 on Evolution of Cenozoic Mammals and Continental Palaeoenvironments.Profound palaeoclimatic changes took place during the Middle Miocene. The Miocene Climatic Optimum (~ 20 to 14–13.5 Ma) was followed by a sudden (~ 200 ka) decrease in temperature and an increase in aridity around the world as a consequence of the reestablishment of the ice cap in Antarctica. Somosaguas palaeontological site (Madrid Basin, Spain) has provided a rich record of mammal remains coincident with this global event (Middle Miocene Biozone E, 14.1–13.8 Ma). It contains four fossiliferous levels (T1, T3-1, T3-2 and T3-3, with T1 being the oldest) that span an estimated time of ~105–125 ka. Scanning Electron Microscope (SEM) and Rare Earth Element (REE) analyses performed on herbivore tooth enamel (Gomphotherium angustidens, Anchitherium cf. A. cursor, Conohyus simorrensis, Prosantorhinus douvillei and ruminants) indicate that diagenetic processes have not been intense enough as to obscure the original geochemical signal. Stable isotope (δ18OCO3, δ13CCO3 and δ18OPO4) analyses have been measured on the herbivore tooth enamel across these levels with the aim of determining to what extent the global cooling and aridity pattern is recorded at this site. A decrease in δ18OCO3 and δ18OPO4 has been detected from T1 to T3-3 and T3-1 to T3-3 respectively indicating a progressive drop of about 6 °C (from around 18 °C to 12 °C) in mean annual temperatures within T3. Tooth enamel δ13C values experience an increase from T3-1 to T3-3 suggesting an increase in aridity. Ba/Ca analyses have also been performed on the tooth enamel in order to detect changes in the palaeoecology of the studied taxa. This ratio allows the establishment of particular feeding patterns such as a more Browsing Habit in the case of Gomphotherium angustidens compared to Anchitherium cf. A. cursor as suggested by higher Ba/Ca values in the latter. Trace elements do not support any significant change across the succession in the dietary behaviour of the species analyzed, despite the stable isotopes evidence of an important palaeoclimatic shift from T1 to T3-3.This research was supported by the UCM and the Spanish Ministerio de Educación y Ciencia (Plan Nacional I + D, project CGL2006-04646 to N.L.M. and a FPU predoctoral contract to L.D.). The work conducted by S.T.G. was supported by a Natural Environmental Research Council (NERC) New Investigators grant (NE/C507237/1). M.H.F. was funded by the MEC through the Programa Ramón y Cajal (UCM contract) and the Plan Nacional I + D (project CGL2006-01773/BTE).Peer reviewe
Grimes, Stephen T. - One of the best experts on this subject based on the ideXlab platform.
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Multiproxy reconstruction of the palaeoclimate and palaeoenvironment of the Middle Miocene Somosaguas site (Madrid, Spain) using herbivore dental enamel
'Elsevier BV', 2009Co-Authors: Domingo Martínez Laura, Cuevas González Jaime, Grimes, Stephen T., Hernández Fernández Manuel, López Martínez NievesAbstract:Profound palaeoclimatic changes took place during the Middle Miocene. The Miocene Climatic Optimum (∼20 to 14–13.5 Ma) was followed by a sudden (∼200 ka) decrease in temperature and an increase in aridity around the world as a consequence of the reestablishment of the ice cap in Antarctica. Somosaguas palaeontological site (Madrid Basin, Spain) has provided a rich record of mammal remains coincident with this global event (Middle Miocene Biozone E, 14.1–13.8 Ma). It contains four fossiliferous levels (T1, T3-1, T3-2 and T3-3, with T1 being the oldest) that span an estimated time of ∼105–125 ka. Scanning Electron Microscope (SEM) and Rare Earth Element (REE) analyses performed on herbivore tooth enamel (Gomphotherium angustidens, Anchitherium cf. A. cursor, Conohyus simorrensis, Prosantorhinus douvillei and ruminants) indicate that diagenetic processes have not been intense enough as to obscure the original geochemical signal. Stable isotope (δ18OCO3, δ13CCO3 and δ18OPO4) analyses have been measured on the herbivore tooth enamel across these levels with the aim of determining to what extent the global cooling and aridity pattern is recorded at this site. A decrease in δ18OCO3 and δ18OPO4 has been detected from T1 to T3-3 and T3-1 to T3-3 respectively indicating a progressive drop of about 6 °C (from around 18 °C to 12 °C) in mean annual temperatures within T3. Tooth enamel δ13C values experience an increase from T3-1 to T3-3 suggesting an increase in aridity. Ba/Ca analyses have also been performed on the tooth enamel in order to detect changes in the palaeoecology of the studied taxa. This ratio allows the establishment of particular feeding patterns such as a more Browsing Habit in the case of Gomphotherium angustidens compared to Anchitherium cf. A. cursor as suggested by higher Ba/Ca values in the latter. Trace elements do not support any significant change across the succession in the dietary behaviour of the species analyzed, despite the stable isotopes evidence of an important palaeoclimatic shift from T1 to T3-3
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Multiproxy reconstruction of the palaeoclimate and palaeoenvironment of the Middle Miocene Somosaguas site (Madrid, Spain) using herbivore dental enamel
'Elsevier BV', 2009Co-Authors: Domingo Laura, Cuevas González Jaime, Grimes, Stephen T., Hernández Fernández M., Lopez-martinez N.Abstract:16 pages, 11 figures, 3 tables.-- Available online Nov 17, 2008.-- This work is a contribution from the research groups UCM-CAM 910161 on Geologic Record of Critical Periods: Palaeoclimatic and Palaeonvironmental Factors, and UCM-CAM 910607 on Evolution of Cenozoic Mammals and Continental Palaeoenvironments.Profound palaeoclimatic changes took place during the Middle Miocene. The Miocene Climatic Optimum (~ 20 to 14–13.5 Ma) was followed by a sudden (~ 200 ka) decrease in temperature and an increase in aridity around the world as a consequence of the reestablishment of the ice cap in Antarctica. Somosaguas palaeontological site (Madrid Basin, Spain) has provided a rich record of mammal remains coincident with this global event (Middle Miocene Biozone E, 14.1–13.8 Ma). It contains four fossiliferous levels (T1, T3-1, T3-2 and T3-3, with T1 being the oldest) that span an estimated time of ~105–125 ka. Scanning Electron Microscope (SEM) and Rare Earth Element (REE) analyses performed on herbivore tooth enamel (Gomphotherium angustidens, Anchitherium cf. A. cursor, Conohyus simorrensis, Prosantorhinus douvillei and ruminants) indicate that diagenetic processes have not been intense enough as to obscure the original geochemical signal. Stable isotope (δ18OCO3, δ13CCO3 and δ18OPO4) analyses have been measured on the herbivore tooth enamel across these levels with the aim of determining to what extent the global cooling and aridity pattern is recorded at this site. A decrease in δ18OCO3 and δ18OPO4 has been detected from T1 to T3-3 and T3-1 to T3-3 respectively indicating a progressive drop of about 6 °C (from around 18 °C to 12 °C) in mean annual temperatures within T3. Tooth enamel δ13C values experience an increase from T3-1 to T3-3 suggesting an increase in aridity. Ba/Ca analyses have also been performed on the tooth enamel in order to detect changes in the palaeoecology of the studied taxa. This ratio allows the establishment of particular feeding patterns such as a more Browsing Habit in the case of Gomphotherium angustidens compared to Anchitherium cf. A. cursor as suggested by higher Ba/Ca values in the latter. Trace elements do not support any significant change across the succession in the dietary behaviour of the species analyzed, despite the stable isotopes evidence of an important palaeoclimatic shift from T1 to T3-3.This research was supported by the UCM and the Spanish Ministerio de Educación y Ciencia (Plan Nacional I + D, project CGL2006-04646 to N.L.M. and a FPU predoctoral contract to L.D.). The work conducted by S.T.G. was supported by a Natural Environmental Research Council (NERC) New Investigators grant (NE/C507237/1). M.H.F. was funded by the MEC through the Programa Ramón y Cajal (UCM contract) and the Plan Nacional I + D (project CGL2006-01773/BTE).Peer reviewe
Cuevas González Jaime - One of the best experts on this subject based on the ideXlab platform.
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Multiproxy reconstruction of the palaeoclimate and palaeoenvironment of the Middle Miocene Somosaguas site (Madrid, Spain) using herbivore dental enamel
'Elsevier BV', 2009Co-Authors: Domingo Martínez Laura, Cuevas González Jaime, Grimes, Stephen T., Hernández Fernández Manuel, López Martínez NievesAbstract:Profound palaeoclimatic changes took place during the Middle Miocene. The Miocene Climatic Optimum (∼20 to 14–13.5 Ma) was followed by a sudden (∼200 ka) decrease in temperature and an increase in aridity around the world as a consequence of the reestablishment of the ice cap in Antarctica. Somosaguas palaeontological site (Madrid Basin, Spain) has provided a rich record of mammal remains coincident with this global event (Middle Miocene Biozone E, 14.1–13.8 Ma). It contains four fossiliferous levels (T1, T3-1, T3-2 and T3-3, with T1 being the oldest) that span an estimated time of ∼105–125 ka. Scanning Electron Microscope (SEM) and Rare Earth Element (REE) analyses performed on herbivore tooth enamel (Gomphotherium angustidens, Anchitherium cf. A. cursor, Conohyus simorrensis, Prosantorhinus douvillei and ruminants) indicate that diagenetic processes have not been intense enough as to obscure the original geochemical signal. Stable isotope (δ18OCO3, δ13CCO3 and δ18OPO4) analyses have been measured on the herbivore tooth enamel across these levels with the aim of determining to what extent the global cooling and aridity pattern is recorded at this site. A decrease in δ18OCO3 and δ18OPO4 has been detected from T1 to T3-3 and T3-1 to T3-3 respectively indicating a progressive drop of about 6 °C (from around 18 °C to 12 °C) in mean annual temperatures within T3. Tooth enamel δ13C values experience an increase from T3-1 to T3-3 suggesting an increase in aridity. Ba/Ca analyses have also been performed on the tooth enamel in order to detect changes in the palaeoecology of the studied taxa. This ratio allows the establishment of particular feeding patterns such as a more Browsing Habit in the case of Gomphotherium angustidens compared to Anchitherium cf. A. cursor as suggested by higher Ba/Ca values in the latter. Trace elements do not support any significant change across the succession in the dietary behaviour of the species analyzed, despite the stable isotopes evidence of an important palaeoclimatic shift from T1 to T3-3
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Multiproxy reconstruction of the palaeoclimate and palaeoenvironment of the Middle Miocene Somosaguas site (Madrid, Spain) using herbivore dental enamel
'Elsevier BV', 2009Co-Authors: Domingo Laura, Cuevas González Jaime, Grimes, Stephen T., Hernández Fernández M., Lopez-martinez N.Abstract:16 pages, 11 figures, 3 tables.-- Available online Nov 17, 2008.-- This work is a contribution from the research groups UCM-CAM 910161 on Geologic Record of Critical Periods: Palaeoclimatic and Palaeonvironmental Factors, and UCM-CAM 910607 on Evolution of Cenozoic Mammals and Continental Palaeoenvironments.Profound palaeoclimatic changes took place during the Middle Miocene. The Miocene Climatic Optimum (~ 20 to 14–13.5 Ma) was followed by a sudden (~ 200 ka) decrease in temperature and an increase in aridity around the world as a consequence of the reestablishment of the ice cap in Antarctica. Somosaguas palaeontological site (Madrid Basin, Spain) has provided a rich record of mammal remains coincident with this global event (Middle Miocene Biozone E, 14.1–13.8 Ma). It contains four fossiliferous levels (T1, T3-1, T3-2 and T3-3, with T1 being the oldest) that span an estimated time of ~105–125 ka. Scanning Electron Microscope (SEM) and Rare Earth Element (REE) analyses performed on herbivore tooth enamel (Gomphotherium angustidens, Anchitherium cf. A. cursor, Conohyus simorrensis, Prosantorhinus douvillei and ruminants) indicate that diagenetic processes have not been intense enough as to obscure the original geochemical signal. Stable isotope (δ18OCO3, δ13CCO3 and δ18OPO4) analyses have been measured on the herbivore tooth enamel across these levels with the aim of determining to what extent the global cooling and aridity pattern is recorded at this site. A decrease in δ18OCO3 and δ18OPO4 has been detected from T1 to T3-3 and T3-1 to T3-3 respectively indicating a progressive drop of about 6 °C (from around 18 °C to 12 °C) in mean annual temperatures within T3. Tooth enamel δ13C values experience an increase from T3-1 to T3-3 suggesting an increase in aridity. Ba/Ca analyses have also been performed on the tooth enamel in order to detect changes in the palaeoecology of the studied taxa. This ratio allows the establishment of particular feeding patterns such as a more Browsing Habit in the case of Gomphotherium angustidens compared to Anchitherium cf. A. cursor as suggested by higher Ba/Ca values in the latter. Trace elements do not support any significant change across the succession in the dietary behaviour of the species analyzed, despite the stable isotopes evidence of an important palaeoclimatic shift from T1 to T3-3.This research was supported by the UCM and the Spanish Ministerio de Educación y Ciencia (Plan Nacional I + D, project CGL2006-04646 to N.L.M. and a FPU predoctoral contract to L.D.). The work conducted by S.T.G. was supported by a Natural Environmental Research Council (NERC) New Investigators grant (NE/C507237/1). M.H.F. was funded by the MEC through the Programa Ramón y Cajal (UCM contract) and the Plan Nacional I + D (project CGL2006-01773/BTE).Peer reviewe
Domingo Martínez Laura - One of the best experts on this subject based on the ideXlab platform.
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Multiproxy reconstruction of the palaeoclimate and palaeoenvironment of the Middle Miocene Somosaguas site (Madrid, Spain) using herbivore dental enamel
'Elsevier BV', 2009Co-Authors: Domingo Martínez Laura, Cuevas González Jaime, Grimes, Stephen T., Hernández Fernández Manuel, López Martínez NievesAbstract:Profound palaeoclimatic changes took place during the Middle Miocene. The Miocene Climatic Optimum (∼20 to 14–13.5 Ma) was followed by a sudden (∼200 ka) decrease in temperature and an increase in aridity around the world as a consequence of the reestablishment of the ice cap in Antarctica. Somosaguas palaeontological site (Madrid Basin, Spain) has provided a rich record of mammal remains coincident with this global event (Middle Miocene Biozone E, 14.1–13.8 Ma). It contains four fossiliferous levels (T1, T3-1, T3-2 and T3-3, with T1 being the oldest) that span an estimated time of ∼105–125 ka. Scanning Electron Microscope (SEM) and Rare Earth Element (REE) analyses performed on herbivore tooth enamel (Gomphotherium angustidens, Anchitherium cf. A. cursor, Conohyus simorrensis, Prosantorhinus douvillei and ruminants) indicate that diagenetic processes have not been intense enough as to obscure the original geochemical signal. Stable isotope (δ18OCO3, δ13CCO3 and δ18OPO4) analyses have been measured on the herbivore tooth enamel across these levels with the aim of determining to what extent the global cooling and aridity pattern is recorded at this site. A decrease in δ18OCO3 and δ18OPO4 has been detected from T1 to T3-3 and T3-1 to T3-3 respectively indicating a progressive drop of about 6 °C (from around 18 °C to 12 °C) in mean annual temperatures within T3. Tooth enamel δ13C values experience an increase from T3-1 to T3-3 suggesting an increase in aridity. Ba/Ca analyses have also been performed on the tooth enamel in order to detect changes in the palaeoecology of the studied taxa. This ratio allows the establishment of particular feeding patterns such as a more Browsing Habit in the case of Gomphotherium angustidens compared to Anchitherium cf. A. cursor as suggested by higher Ba/Ca values in the latter. Trace elements do not support any significant change across the succession in the dietary behaviour of the species analyzed, despite the stable isotopes evidence of an important palaeoclimatic shift from T1 to T3-3
