Hema Achyuthan
Datos Biográficos
| ID | 772630 |
|---|---|
| NOMBRE | Hema Achyuthan |
| NOMBRES | Hema |
| APELLIDO | Achyuthan |
| FIRMA | ACHYUTHAN H |
| AFILIACIONES | Anna University, Chennai |
| ORCID | 0000-0001-5495-4115 |
| VERIFICADO | Sí |
| TOTAL DE OBRAS | 31 |
| TOTAL DE CITAS | 33 |
| TOTAL COMO AUTOR | 31 |
| TOTAL COMO EDITOR | 0 |
| PRIMER AÑO DE PUBLICACIÓN | 2002 |
| AÑO MÁS RECIENTE DE PUBLICACIÓN | 2026 |
| ÍNDICE H | 4 |
The Trans-Evol project
L’apparition d’Homo sapiens il y a plus de 233 ka en Afrique (Vidal et al., 2022), est le fruit d’un processus évolutif long et complexe qui a donné naissance à de nombreuses espèces d’hominines. Le bassin du Turkana, dans le rift Est-Africain, contient une multitude de preuves archéologiques et paléontologiques illustrant ce processus. Celles-ci sont inégalement réparties sur le territoire dont de nombreuses zones restent encore largement inexpl…
Kanyimangin
The Early to Middle Pleistocene Transition (EMPT) is characterised by major environmental changes and evolutionary innovations within the genus Homo but the scarcity of the African EMPT fossil and archaeological records obscures its palaeoecological context. Here, we present archaeological and faunal evidence from a newly excavated West-Turkana EMPT site-Kanyimangin
Understanding the Late Quaternary Paleomonsoon and Paleoenvironmental Shifts of Asia
Middle to late Holocene alluvial history of the northeast monsoon dominated coastal tropical rivers of south India
Holocene climate events and associated land use changes in the eastern coast of India
The Holocene arid events and related societal responses are important scientific inquiries due to concerns about their reoccurrences in the future. In the Indian subcontinent, significant number of studies have focussed on understanding the Holocene aridification events at 8.2 and 4.2 ka. Despite these studies, high resolution palaeoclimatic records from the eastern India during Holocene, particularly around the above-mentioned aridification even…
The Trans-Evol project
The Trans-Evol project (Early to Middle Pleistocene Transition: Evolution and diversity of African hominin fossil populations) is a collaboration between the CNRS, the National Museums of Kenya and the University of Cambridge. The project is opening new archaeological excavations in West-Turkana (Kenya) to document the behavioural, cognitive and morphological diversity of hominin populations during the Early to Middle Pleistocene Transition (EMPT…
Holocene evolution of the Palar river, Southern India
The marine record of the onset of farming around the Arabian Sea at the dawn of the Bronze Age
The rise and fall of human cultures are strongly modulated by the strong environmental changes taking place during the Holocene. Here, we use the sedimentological and geochemical records of a core taken in the Arabian Sea, west of Kerala, to identify potential factors that may reflect on-land history of local civilizations, in particular the Harappan culture which appeared and collapsed in the Indus Valley during the early and middle Bronze Age. …
Holocene palaeoenvironmental records from the high-altitude Wular Lake, Western Himalayas
We present a comprehensive record of Holocene (11,590–628 cal. yr BP) climate and hydrographic changes around the Wular Lake located in Kashmir Valley, India. Based on the multi-proxy investigations, we have identified three phases of wet climate conditions that prevailed from the commencement of the Holocene Epoch – 9000 cal. yr BP, 8100–6650 cal. yr BP and 6350–5000 cal. yr BP, whereas periods of dry climate were observed during 9000–8100 cal. …
Tropical Rainforest Dynamics and Palaeoclimate Implications since the late Pleistocene, Nilgiris, India
A multiproxy study involving sedimentology, palynology, radiocarbon dating, stable isotopes, and geochemistry was carried out on the Parsons Valley Lake deposit, Nilgiris, India, to determine palaeoclimatic fluctuations and their possible impact on vegetation since the late Pleistocene. The 72-cm-deep sediment core that was retrieved reveals five distinct palaeoclimatic phases: (1) Warm and humid conditions with a high lake stand before the last …
Late Holocene paleoenvironmental changes inferred from Manasbal Lake sediments, Kashmir Valley, India
Paleoenvironmental shifts spanning the last ~6000 years and recent anthropogenic controls inferred from a high-altitude temperate lake
Integrating multiproxy results (geochemistry, mineral magnetism, grain size, and C/N ratio variability supported by 14 C AMS dating), obtained from a 1.4-m sediment core retrieved from high-altitude Anchar Lake, Kashmir Valley, NW Himalaya, we present a 6000-years record of paleoenvironmental and paleolimnological shifts. Phase 1 (6000–4700 cal. yr BP) revealed a wetter climate with a significant terrestrial input corresponding to the gradual str…
The Toba tephra as a late Quaternary stratigraphic marker
Asian Paleomonsoon Reconstructions
Northeast monsoon variations during the Holocene inferred from palaeochannels and active channels of the Palar River basin, Southern Peninsular India
The present-day Palar River and its palaeochannel located in the Southern Peninsular India were investigated with a multidisciplinary approach. The main aim of the study was to reconstruct the palaeoenvironment history of the Palar River basin and to delineate the role of Holocene fluctuations that played a major role in the geomorphological evolution of the region since the Holocene period. The results obtained based on sedimentary facies analys…
Palaeoenvironmental dynamics and Palaeolithic occupation at Katoati, Thar Desert, India
Late Pleistocene palaeoenvironments in the Thar Desert (India), located at the eastern extent of the Saharo-Arabian desert belt, have fluctuated considerably as a result of the varying range and intensity of the Indian summer monsoon. Phases of widespread Pleistocene aridity are well documented in the Thar Desert, but research focusing on humid proxies is critical to examine how the region may have facilitated population expansions across souther…
Middle to late Holocene paleochannels and migration of the Palar River, Tamil Nadu
Inter-group violence among early Holocene hunter-gatherers of West Turkana, Kenya
Early-Holocene to present palaeoenvironmental shifts and short climate events from the tropical wetland and lake sediments, Kukkal Lake, Southern India
The Kukkal basin, Tamil Nadu, India, receives most of its rain from the southwest monsoon (SWM). A sediment core from Kukkal Lake preserves a continuous sediment record from the early-Holocene to present (9000 yr BP to present). The present lake is situated at an elevation of ~1887 m a.s.l., in a small basin that appears to have alternated between a and wetland depositional environment. Climate proxies, including sediment texture, total organic c…
Late Holocene continental shelf sediments, off Cuddalore, East coast, Bay of Bengal, India
Middle Palaeolithic point technologies in the Thar Desert, India
Distinction between the Youngest Toba Tuff and Oldest Toba Tuff from northern Sumatra based on the area density of spontaneous fission tracks in their glass shards
Determination of the area density of spontaneous fission tracks (ρ s ) in glass shards of Toba tephra is a reliable way to distinguish between the Youngest Toba Tuff (YTT) and the Oldest Toba Tuff (OTT). The ρ s values for YTT, uncorrected for partial track fading, range from 70 to 181 tracks/cm 2 with a weighted mean of 108 ± 5 tracks/cm 2 , based on 15 samples. Corrected ρ s values for YTT are in the range of 77–140 tracks/cm 2 with a weighted …
Mid-Holocene Indian Summer Monsoon variability off the Andaman Islands, Bay of Bengal
A multi-proxy reconstruction of monsoon variability in the late Holocene, South India
Human impact on low-land Vellayani Lake, south India
Middle Palaeolithic point technologies in the Thar Desert, India
Paleoenvironmental shifts spanning the last ~6000 years and recent anthropogenic controls inferred from a high-altitude temperate lake
Integrating multiproxy results (geochemistry, mineral magnetism, grain size, and C/N ratio variability supported by 14 C AMS dating), obtained from a 1.4-m sediment core retrieved from high-altitude Anchar Lake, Kashmir Valley, NW Himalaya, we present a 6000-years record of paleoenvironmental and paleolimnological shifts. Phase 1 (6000–4700 cal. yr BP) revealed a wetter climate with a significant terrestrial input corresponding to the gradual str…
The Toba tephra as a late Quaternary stratigraphic marker
Holocene palaeoenvironmental records from the high-altitude Wular Lake, Western Himalayas
We present a comprehensive record of Holocene (11,590–628 cal. yr BP) climate and hydrographic changes around the Wular Lake located in Kashmir Valley, India. Based on the multi-proxy investigations, we have identified three phases of wet climate conditions that prevailed from the commencement of the Holocene Epoch – 9000 cal. yr BP, 8100–6650 cal. yr BP and 6350–5000 cal. yr BP, whereas periods of dry climate were observed during 9000–8100 cal. …
Situating megalithic burials in the Iron Age-Early Historic landscape of southern India
The megalithic burials of southern India-a wonderfully varied set of monuments-have long needed a chronology and a context. Broadly contemporary with the Roman and Sasanian empires, these dolmens, cairns and cists have continually raised contradictions with their material contents. The authors attack the problem using luminescence applied to pottery at the site of Siruthavoor in north-east Tamilnadu. Although sharing material culture, this first …
Early-Holocene to present palaeoenvironmental shifts and short climate events from the tropical wetland and lake sediments, Kukkal Lake, Southern India
The Kukkal basin, Tamil Nadu, India, receives most of its rain from the southwest monsoon (SWM). A sediment core from Kukkal Lake preserves a continuous sediment record from the early-Holocene to present (9000 yr BP to present). The present lake is situated at an elevation of ~1887 m a.s.l., in a small basin that appears to have alternated between a and wetland depositional environment. Climate proxies, including sediment texture, total organic c…
Holocene climate events and associated land use changes in the eastern coast of India
The Holocene arid events and related societal responses are important scientific inquiries due to concerns about their reoccurrences in the future. In the Indian subcontinent, significant number of studies have focussed on understanding the Holocene aridification events at 8.2 and 4.2 ka. Despite these studies, high resolution palaeoclimatic records from the eastern India during Holocene, particularly around the above-mentioned aridification even…
Human impact on low-land Vellayani Lake, south India
Coastal Response to Changes in Sea Level Since the Last 4500 BP On the East Coast of Tamil Nadu, India
Geomorphology, clay mineral composition, and radiocarbon dates from Muttukadu to Marakkanam estuaries and the tidal zone along the east coast of Tamil Nadu, India, have been used to reconstruct coastal evolution between approximately 4500 and 1100 B P. Formation of alternate oyster beds with intervening tidal clay units indicate fluctuation in the sea level may be a consequence of changes in the Mid-Holocene sedimentation pattern and coastal conf…
Coastal Response to Changes in Sea Level Since the Last 4500 BP On the East Coast of Tamil Nadu, India
Geomorphology, clay mineral composition, and radiocarbon dates from Muttukadu to Marakkanam estuaries and the tidal zone along the east coast of Tamil Nadu, India, have been used to reconstruct coastal evolution between approximately 4500 and 1100 B P. Formation of alternate oyster beds with intervening tidal clay units indicate fluctuation in the sea level may be a consequence of changes in the Mid-Holocene sedimentation pattern and coastal conf…
Petrologic analysis and geochemistry of the Late Neogene-Early Quaternary hardpan calcretes of Western Rajasthan, India
Stable isotopic composition of pedogenic carbonates from the eastern margin of the Thar Desert, Rajasthan, India
Genesis of calcic and petrocalcic horizons from Coimbatore, Tamil Nadu
Geochemistry of calcretes (calcic palaeosols and hardpan), Coimbatore, Southern India
Situating megalithic burials in the Iron Age-Early Historic landscape of southern India
The megalithic burials of southern India-a wonderfully varied set of monuments-have long needed a chronology and a context. Broadly contemporary with the Roman and Sasanian empires, these dolmens, cairns and cists have continually raised contradictions with their material contents. The authors attack the problem using luminescence applied to pottery at the site of Siruthavoor in north-east Tamilnadu. Although sharing material culture, this first …
Distinction between the Youngest Toba Tuff and Oldest Toba Tuff from northern Sumatra based on the area density of spontaneous fission tracks in their glass shards
Determination of the area density of spontaneous fission tracks (ρ s ) in glass shards of Toba tephra is a reliable way to distinguish between the Youngest Toba Tuff (YTT) and the Oldest Toba Tuff (OTT). The ρ s values for YTT, uncorrected for partial track fading, range from 70 to 181 tracks/cm 2 with a weighted mean of 108 ± 5 tracks/cm 2 , based on 15 samples. Corrected ρ s values for YTT are in the range of 77–140 tracks/cm 2 with a weighted …
Mid-Holocene Indian Summer Monsoon variability off the Andaman Islands, Bay of Bengal
A multi-proxy reconstruction of monsoon variability in the late Holocene, South India
Human impact on low-land Vellayani Lake, south India
Late Holocene continental shelf sediments, off Cuddalore, East coast, Bay of Bengal, India
Middle Palaeolithic point technologies in the Thar Desert, India
Inter-group violence among early Holocene hunter-gatherers of West Turkana, Kenya
Early-Holocene to present palaeoenvironmental shifts and short climate events from the tropical wetland and lake sediments, Kukkal Lake, Southern India
The Kukkal basin, Tamil Nadu, India, receives most of its rain from the southwest monsoon (SWM). A sediment core from Kukkal Lake preserves a continuous sediment record from the early-Holocene to present (9000 yr BP to present). The present lake is situated at an elevation of ~1887 m a.s.l., in a small basin that appears to have alternated between a and wetland depositional environment. Climate proxies, including sediment texture, total organic c…
Palaeoenvironmental dynamics and Palaeolithic occupation at Katoati, Thar Desert, India
Late Pleistocene palaeoenvironments in the Thar Desert (India), located at the eastern extent of the Saharo-Arabian desert belt, have fluctuated considerably as a result of the varying range and intensity of the Indian summer monsoon. Phases of widespread Pleistocene aridity are well documented in the Thar Desert, but research focusing on humid proxies is critical to examine how the region may have facilitated population expansions across souther…
Middle to late Holocene paleochannels and migration of the Palar River, Tamil Nadu
Asian Paleomonsoon Reconstructions
Northeast monsoon variations during the Holocene inferred from palaeochannels and active channels of the Palar River basin, Southern Peninsular India
The present-day Palar River and its palaeochannel located in the Southern Peninsular India were investigated with a multidisciplinary approach. The main aim of the study was to reconstruct the palaeoenvironment history of the Palar River basin and to delineate the role of Holocene fluctuations that played a major role in the geomorphological evolution of the region since the Holocene period. The results obtained based on sedimentary facies analys…
Tropical Rainforest Dynamics and Palaeoclimate Implications since the late Pleistocene, Nilgiris, India
A multiproxy study involving sedimentology, palynology, radiocarbon dating, stable isotopes, and geochemistry was carried out on the Parsons Valley Lake deposit, Nilgiris, India, to determine palaeoclimatic fluctuations and their possible impact on vegetation since the late Pleistocene. The 72-cm-deep sediment core that was retrieved reveals five distinct palaeoclimatic phases: (1) Warm and humid conditions with a high lake stand before the last …
Late Holocene paleoenvironmental changes inferred from Manasbal Lake sediments, Kashmir Valley, India
Paleoenvironmental shifts spanning the last ~6000 years and recent anthropogenic controls inferred from a high-altitude temperate lake
Integrating multiproxy results (geochemistry, mineral magnetism, grain size, and C/N ratio variability supported by 14 C AMS dating), obtained from a 1.4-m sediment core retrieved from high-altitude Anchar Lake, Kashmir Valley, NW Himalaya, we present a 6000-years record of paleoenvironmental and paleolimnological shifts. Phase 1 (6000–4700 cal. yr BP) revealed a wetter climate with a significant terrestrial input corresponding to the gradual str…
The Toba tephra as a late Quaternary stratigraphic marker
The marine record of the onset of farming around the Arabian Sea at the dawn of the Bronze Age
The rise and fall of human cultures are strongly modulated by the strong environmental changes taking place during the Holocene. Here, we use the sedimentological and geochemical records of a core taken in the Arabian Sea, west of Kerala, to identify potential factors that may reflect on-land history of local civilizations, in particular the Harappan culture which appeared and collapsed in the Indus Valley during the early and middle Bronze Age. …
Holocene palaeoenvironmental records from the high-altitude Wular Lake, Western Himalayas
We present a comprehensive record of Holocene (11,590–628 cal. yr BP) climate and hydrographic changes around the Wular Lake located in Kashmir Valley, India. Based on the multi-proxy investigations, we have identified three phases of wet climate conditions that prevailed from the commencement of the Holocene Epoch – 9000 cal. yr BP, 8100–6650 cal. yr BP and 6350–5000 cal. yr BP, whereas periods of dry climate were observed during 9000–8100 cal. …
Holocene evolution of the Palar river, Southern India
Geology and Paleoclimatology Research (24 obras) · Geology (23 obras) · Geography (21 obras) · Holocene (16 obras) · Oceanography (16 obras) · Paleontology (16 obras) · Physical geography (14 obras) · Structural basin (12 obras) · Archaeology and ancient environmental studies (11 obras) · Geological formations and processes (11 obras)