The Volgian-Valanginian succession of shallow-water deposits from the Olenek section(Anabar-Lena region,Arctic Siberia)has been studied by sedimentological and palaeontological methods.High-resolution biostratigraphy ...The Volgian-Valanginian succession of shallow-water deposits from the Olenek section(Anabar-Lena region,Arctic Siberia)has been studied by sedimentological and palaeontological methods.High-resolution biostratigraphy of studied interval is based on the ammonites,foraminifers,marine and terrestrial palynomorphs.Foraminiferal and palynological zones have important regional implications providing well-constrained biostratigraphy of the Anabar-Lena region.Sedimentological studies together with ecological analysis of the associations of microbenthos,microphytoplankton and terrestrial palynomorphs allow the palaeoenvironmental reconstructions for the marginal area of the Anabar-Lena palaeosea and coastal land areas.展开更多
A comparative analysis of Late Jurassic-Early Cretaceous strata have been done for the Sanjiang Middle Amur basin, a coaland oil-bearing area spanning the eastern Heilongjiang of northeastern China and southeastern Fa...A comparative analysis of Late Jurassic-Early Cretaceous strata have been done for the Sanjiang Middle Amur basin, a coaland oil-bearing area spanning the eastern Heilongjiang of northeastern China and southeastern Far East of Russia. On the basis of various fossils occurring in the formations, particularly by means of the Tithonian-Valanginian index Buchia and the late Barremian-middle Albian indicator Aucellina assemblages, the marine and non-marine Late Jurassic-Early Cretaceous strata in the basin are correlated. The Mesozoic international chronostratigraphic chart (http://www.stratigra phy.org) is established basically based on the marine rocks. To accurately date the non-marine strata, it is necessary to correlate them with the marine deposits. This study sheds new light on the dating and correlation of non-marine Upper Mesozoic. Additionally, the results would help understand the tectonics and paleogeography and thus aid the exploration of energy resources.展开更多
The history of amber and its trade in Lebanon dates back to ancient times,during the Phoenician civilization.Amber in Lebanon can be found in over 450 outcrops,comprising approximately 10%of the country’s land.Some o...The history of amber and its trade in Lebanon dates back to ancient times,during the Phoenician civilization.Amber in Lebanon can be found in over 450 outcrops,comprising approximately 10%of the country’s land.Some of these outcrops are Late Jurassic(Kimmeridgian)in age,while the majority are Early Cretaceous(early Barremian).The Early Cretaceous amber found in Lebanon is the oldest amber with extensive biological inclusions,making it a crucial source of knowledge regarding continental palaeobiodiversity during the Early Cretaceous period.This period is widely recognized as witnessing the first occurrence and early evolution of angiosperms,representing a critical time for the co-evolution between flowering plants and insects.In Lebanese amber,biological inclusions often serve as records of the earliest representatives of modern living insect families or the youngest ones for extinct families.展开更多
基金Financial support:Russian Science Foundation 18-17-00038Scientific support:Russian FSI 0331-2019-0004IGCP 679,632
文摘The Volgian-Valanginian succession of shallow-water deposits from the Olenek section(Anabar-Lena region,Arctic Siberia)has been studied by sedimentological and palaeontological methods.High-resolution biostratigraphy of studied interval is based on the ammonites,foraminifers,marine and terrestrial palynomorphs.Foraminiferal and palynological zones have important regional implications providing well-constrained biostratigraphy of the Anabar-Lena region.Sedimentological studies together with ecological analysis of the associations of microbenthos,microphytoplankton and terrestrial palynomorphs allow the palaeoenvironmental reconstructions for the marginal area of the Anabar-Lena palaeosea and coastal land areas.
基金Supported by National Natural Science Foundation of China (Grant Nos. 40632010, 40072004)National Basic Research Program of China (Grant No. 2006CB806400)
文摘A comparative analysis of Late Jurassic-Early Cretaceous strata have been done for the Sanjiang Middle Amur basin, a coaland oil-bearing area spanning the eastern Heilongjiang of northeastern China and southeastern Far East of Russia. On the basis of various fossils occurring in the formations, particularly by means of the Tithonian-Valanginian index Buchia and the late Barremian-middle Albian indicator Aucellina assemblages, the marine and non-marine Late Jurassic-Early Cretaceous strata in the basin are correlated. The Mesozoic international chronostratigraphic chart (http://www.stratigra phy.org) is established basically based on the marine rocks. To accurately date the non-marine strata, it is necessary to correlate them with the marine deposits. This study sheds new light on the dating and correlation of non-marine Upper Mesozoic. Additionally, the results would help understand the tectonics and paleogeography and thus aid the exploration of energy resources.
基金国家自然科学基金青年科学基金项目(编号:41602125,41702124)、国家自然科学基金项目(编号:41372109,41672111,41772272)、中国博士后科学基金项目(编号:2016M601085)及中国地质调查局项目(编号:12120115003401)联合资助.[Co-funded by the Young Scientists Foundation of National Natural Science Foundation of China(Nos.41602125,417021
文摘The history of amber and its trade in Lebanon dates back to ancient times,during the Phoenician civilization.Amber in Lebanon can be found in over 450 outcrops,comprising approximately 10%of the country’s land.Some of these outcrops are Late Jurassic(Kimmeridgian)in age,while the majority are Early Cretaceous(early Barremian).The Early Cretaceous amber found in Lebanon is the oldest amber with extensive biological inclusions,making it a crucial source of knowledge regarding continental palaeobiodiversity during the Early Cretaceous period.This period is widely recognized as witnessing the first occurrence and early evolution of angiosperms,representing a critical time for the co-evolution between flowering plants and insects.In Lebanese amber,biological inclusions often serve as records of the earliest representatives of modern living insect families or the youngest ones for extinct families.
