Publications
A YOLO-Based Workflow for Detecting and Mapping Archaeological Stone Cairns in Satellite Imagery: A Case Study from Western Ennedi, Chad
A deep learning framework using the YOLOv8 model achieves highly accurate detection of archaeological stone cairns in high-resolution satellite imagery, with precision and recall rates exceeding 83.5%. This non-invasive approach offers a scalable solution for documenting vulnerable heritage landscapes, such as those in the Ennedi Massif, where traditional field surveys are impractical due to remote terrain. The model, trained on GPS-verified cairns, demonstrated stable performance across diverse illumination conditions and outperformed YOLOv5n in localization accuracy while maintaining competitive precision and F1-scores. This workflow enables large-scale archaeological prospection and heritage monitoring, providing a critical tool for preserving and studying remote desert environments.
A world-class example of a Late Palaeozoic glaciated landscape in Chad
A newly discovered pristine channel belt on the Ennedi Plateau, Chad, reveals complex palaeo-morphological features that provide unprecedented insight into the Late Carboniferous glaciation. This 300 km² network of braided and meandering channels, up to 250 m wide, shows distinctive point bar deposits and scroll bar geometries, indicating a terrestrial, subaerial environment rather than subglacial origin. These features are intercalated with glacial lineations (GLs), suggesting ice activity both preceded and succeeded fluvial activity during the advance-retreat cycles of the Late Palaeozoic Ice Age. Remote sensing techniques revealed that the Chadian ice sheet covered at least 20,000 km²—three times larger than previously estimated—with GLs arranged in widespread ice stream networks, indicating palaeo-ice flow to the north.
Chad's cabinet of icy curiosities: Sharpening the interpretation of subglacial and ice marginal environments during the LPIA glaciation of the Ennedi Plateau
Researchers have uncovered the first known evidence of soft-sediment striated surfaces and a fully preserved grounding zone wedge (GZW) in the Ennedi Massif, Chad, offering unprecedented insights into the behavior of a mid-latitude, marine-terminating ice sheet during the Late Palaeozoic Ice Age (LPIA). These findings suggest the presence of a soft-deformable bed that could explain extensive mega-scale glacial lineations across the plateau. The study utilized satellite imagery and band-ratio techniques to analyze proglacial, ice-marginal, and subglacial structures, providing a detailed interpretation of this exceptional palaeo-ice stream landscape.
Late Paleozoic glaciated landscape in northern Africa as an outstandingly well-preserved analogue to Quaternary deglaciated areas
The Ennedi Massif in Chad reveals an exceptionally well-preserved Paleozoic ice stream landscape, offering a unique analogue to Quaternary deglaciated regions. This study identifies a grounding zone wedge—a feature that reconstructs the former coastline—using large-scale glacial lineations and convex topography orthogonal to these structures. The absence of vegetation in the desert environment highlights subglacial, ice-marginal, and proglacial features, including inverted channel sediments that may record meltwater release phases during ice retreat. This landscape provides a rare opportunity to study the spatial relationships between components of an ancient ice sheet, enhancing our understanding of modern glaciated areas.
The Ordovician strata of the Ennedi Plateau, northeastern Chad (Erdi Basin)
The Ennedi Massif, a UNESCO World Heritage Site in northeastern Chad, preserves a critical record of Early to Middle Ordovician flooding events and the end-Ordovician glaciation. This study reveals that the Lower Sandstones, characterized by fluvial-dominated deposits with NW to NNE paleocurrent trends, were interrupted by high-frequency marine incursions marked by tidal deposits and ichnofacies such as Cruziana and Arthrophycus. Above an erosional unconformity, evidence of glaciation is documented through fluvioglacial conglomeratic deposits, which are overlain by the fine-grained Bedo Formation. The latter contains glaciomarine deposits at its base and possibly extends into the Lower Silurian in its upper part, onlapping an exhumed erosion surface with north-trending glacial lineations. This research provides insights into the paleogeographic dynamics of the Gondwana platform during a pivotal period of Earth's history.
Cartographie des zones de reproduction et de grégarisation du criquet pèlerin au Tchad
A recent study has identified three key zones in Chad—Kanem/lac Tchad, Batha, and Ennedi—as critical areas for the reproduction and gregarization (swarming) of the desert locust (Schistocerca gregaria), a major agricultural pest. These findings suggest that Kanem/lac Tchad may represent a new focal area for locust swarm formation, expanding our understanding of their spatial distribution. Researchers analyzed over 7,000 historical observations (1965–2017) using spatial density smoothing techniques to map seasonal patterns during invasion and remission phases. While the Tibesti massif remains a known hotspot, reports from this region have declined due to security challenges. The study highlights the need for more consistent monitoring to assess potential shifts in locust distribution over time.
Pre-Islamic Oasis Settlements in the Southern Sahara
Pre-Islamic oasis settlements in the southern Sahara, particularly those around mountain massifs like Ennedi, Tibesti, Aïr, and Tassili n’Ajjer, are characterized by limited agricultural suitability due to variable rainfall and dynamic wadi systems. These regions, though historically important for pastoralism, lack stable conditions for oasis agriculture, contributing to the poor preservation of archaeological remains. The study highlights that while these areas once supported crocodile populations—evidenced by 19th- and early-20th-century reports—their environmental constraints have hindered long-term settlement stability.
An exhumed Paleozoic glacial landscape in Chad
A newly discovered late Paleozoic glacial landscape, dating back to the Visean age, has been identified within the UNESCO World Heritage Site of Ennedi Massif: Natural and Cultural Landscape in northern Chad. Satellite imagery analysis revealed at least five paleo-ice stream pathways, each 5–12 km wide, characterized by mega-scale glacial lineations (MSGLs) and occasional drumlins. These features, confined to low-lying areas representing ancient valley networks, exhibit sinuous geometries and occur on multiple stratigraphic levels, confirming their geological antiquity through dissection by late Neogene rivers and fault offsets. The pathways suggest the presence of a previously unknown paleo-ice sheet that flowed northward toward present-day Libya, with an estimated ice margin thickness of less than 250 meters. This discovery significantly expands the known extent of late Paleozoic ice sheets and has implications for understanding sea-level changes during this period.
Scorpions from Ennedi, Kapka and Tibesti, the mountains of Chad, with descriptions of nine new species (Scorpiones: Buthidae, Scorpionidae)
A comprehensive study of scorpions from the Ennedi, Kapka, and Tibesti mountain massifs in Chad has unveiled nine previously undescribed species, including Androctonus pallidus, Buthacus golovatchi, and Scorpio ennedi. These discoveries highlight a unique and potentially endemic fauna in these Saharan regions. The research employed systematic analysis of collected specimens to identify and describe the new species, contributing valuable insights into the biodiversity and biogeography of scorpions in North African mountain ranges. The findings also provide comparative context for understanding scorpion distributions across other Saharan massifs.
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