Abstract The Cauvery Basin in East India represents a failed rift zone in the west and transform-related termination in the east. The deformation associated with a westward-propagating rift zone involves stretching and necking-related deformation from west to east. The rift axis and the flanks exhibit maximum and minimum deformation. In this study, we document the increasing role of buoyancy-driven processes and the development of the rift asymmetry during the advanced stages of rifting in a magma-poor setting. We use a series of reflection seismic profiles intersecting the failed rift zone maturing eastward. The onset of buoyancy-controlled extension correlates with the localized extension. It creates a relatively symmetrical axial dome, and exhibits rift flank rotations and central up-warping. This permanent uplift is associated with lower crustal ductile flow. Notably, the deep-seated syn-rift buoyancy forces progressively operate eastward. We deduce the associated transient dome uplift and its subsequent dissipation using a seismic flattening technique. The axial dome formation is associated with an upwelling asthenosphere and lower lithospheric mantle. This correlates with localized contraction within flat-lying fault blocks at its flanks, concurrently forming the typical hanging-wall and footwall geometry. The multiple shallow- to deep-seated mechanisms promote strain acceleration in the uplifted regions along the rift zone.

Abstract Kibbanahalli is an important Lower Palaeolithic site-complex in southern Karnataka, a state in the southern region of Peninsular India. This region is crucial as it is somewhat centrally located between areas to the north, east and south, where decades of systematic Palaeolithic research has led to the establishment of firm cultural stratigraphy(ies) and even, in some cases, of chronology(ies). However, in stark contrast to these regions, southern Karnataka is often ignored in prehistoric research. Over 90 years of (intermittent) investigations at this site-complex have laid the foundations of our understanding of the Palaeolithic occupation of this region. It is of utmost importance to continue Palaeolithic research in this area as it is one of the fastest-growing industrializing and urbanizing zones of the world, with large population centres such as Bangalore (Bengaluru), Mysore (Mysuru) and others located here. Documenting the rich Palaeolithic heritage in this region before its eventual surrender to the forces of ‘development’ is thus a priority. Further, it is also necessary, if possible, to qualify and quantify the impact of these developmental processes on the visibility and preservation of the archaeological record, in general, and the Palaeolithic record, in particular, which might serve as a model for future research in similar regions. These recent investigations have led to the identification of many new Palaeolithic localities, and a secure identification of the technological attribution of their lithic assemblages. The presence of a uniform stratigraphic association of the archaeological horizon and similarities in their lithic collections has led to the reclassification of the many localities at Kibbanahalli and its vicinity into a site-complex. This paper reports on a series of field observations and remotely sensed data collected to understand the distribution pattern of the various Palaeolithic localities of this site-complex. Results of this study highlight the critical role played by modern-day land-use patterns on the observed distribution of the archaeological record, as well as its visibility. This observation challenges previous interpretations regarding the settlement patterns and strategies suggested for the Palaeolithic occupation of this region. Further, this study draws attention to the need and necessity to understand the role of various site formation processes, especially modern-day land-use activities, on the observed and observable patterns in the archaeological record, as well as the visibility, or lack thereof, of the archaeological record.

Abstract Rivers and river-borne deposits have always been a major attraction for hominins as an important source of sustenance and settlements. Hence, fluvial deposits have long been an important source of evidence for early human occupation throughout the Old World. Apart from being an important palaeoclimatic marker, fluvial sequences have provided archaeologists with frameworks for correlation, along with Palaeolithic markers discovered within them. Moreover, given the influx of sediments eroded and deposited by Indian rivers, these could have acted as a centre of hominin activities. Palaeolithic research in India has been concentrated around some of its major river valleys, which have yielded a rich record of hominin occupation. So far, 305 Palaeolithic sites have been reported from a gravel context throughout the country, yielding Lower to Upper Palaeolithic, Mesolithic and Neolithic evidence. However, most of the derived evidence is secondary deposits and stands contested based on its contextuality. Nevertheless, its importance as a source of information about hominin activity cannot be underestimated. This review presents a provisional synthesis of all of the Indian Palaeolithic sites reported from gravel contexts, thereby presenting scope for future multidisciplinary research at these localities.