Research Article Structural Overview and Morphotectonic Evolution of a Strike-Slip Fault in the Zone of North Almora Thrust, Central Kumaun Himalaya, India Lalit M. Joshi, 1 Pitamber D. Pant, 1 Bahadur S. Kotlia, 1 Girish C. Kothyari, 2 Khayingshing Luirei, 3 and Anoop K. Singh 1 1 Centre of Advanced Study in Geology, Kumaun University, Nainital 263002, India 2 Institute of Seismological Research, Raisan, Gandhinagar, Gujarat 382009, India 3 Wadia Institute of Himalayan Geology, Dehradun 248001, India Correspondence should be addressed to Lalit M. Joshi; joshilalit81@gmail.com Received 3 July 2015; Revised 28 December 2015; Accepted 31 December 2015 Academic Editor: Karoly Nemeth Copyright © 2016 Lalit M. Joshi et al. Tis is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Te aim of the present research is to provide the base line details of the NNW-SSE trending Raintoli fault (RF) which is running parallel to the North Almora Trust (NAT) along the Saryu valley from Seraghat-Naichun to Seri in the central sector of the Uttarakhand Himalaya, India. Te RF is characterized as dextral strike slip fault and behaves as a ductile shear zone within the zone of NAT. Te dextral sense of shear movement of RF is delineated by the fabric of the shear zone rocks including microscopically observed indicators such as sigma and delta porphyroclasts, quartz c-axis, and the feld structural data. Additionally, in the quaternary period the dextral strike slip fault is reactivated with oblique slip component as characterized by various geomorphic indicators, for example, triangular facets, abandoned river channels, unpaired fuvial terraces, and V-shaped valleys with recurrent seismicity. Further, the morphometric parameters including Valley Floor Width to Valley Height (  ), asymmetry factor (AF), and gradient index (GI) further prove active nature of RF as suggested by low values of hypsometric integration, V-shaped valley, higher gradient index, and tilting of Saryu basin. 1. Introduction Te Himalaya has been divided into four lithotectonic sub- division from south to north, for example, Siwalik or Sub- Himalaya, Lesser Himalaya, Higher Himalaya, and Tethys Himalaya [1]. Te intracrustal boundary thrusts, for example, Himalayan Frontal Trust (HFT), Main Boundary Trust (MBT), Main Central Trust (MCT), and Trans Himadri Fault (THF), have been separating the lithotectonic unit from south to north, respectively (Figure 1(a)). Further, the Lesser (Central) Kumaun Himalaya, stretching from Nepal to Himachal Pradesh, is characterized by allochthons nappes (Trust sheets), for example, Almora nappe, Ramgarh nappe, and Krol nappe, and tectonic windows within which the Precambrian-Cambrian autochthons are exposed [1, 2]. Te Almora nappe is a consequence of tectonic transport of the rocks of Higher Himalayan Metamorphic Belt to the Lesser Himalaya over the Main Central Trust (MCT) during Eocene–Oligocene [3, 4]. Te Almora nappe is the largest of the Klippe/nappes distributed along the Himalayan arc [5]. Te northern and southern fanks of Almora nappe were described as the North Almora Trust (NAT) and South Almora Trust (SAT), respectively [2]. Te southern limb is thicker and gently dipping about 20 ∘ –30 ∘ toward NNE/NE direction, whereas the northern limb is thinner and steeply inclined, for example, 45 ∘ –75 ∘ SSW/SW [6]. Further, a large scale shear zone of the NAT is characterized by the presence of the mylonitic sequence [7–9]. Moreover, the Lesser Himalaya is characterized by the tear faults and frac- ture zones are oriented predominantly NW/NNW–SE/SSE direction [10]. Tus, the thrust bounded synclinal nappes and the subsidiary thrusts/faults have been reactivated in the Hindawi Publishing Corporation Journal of Geological Research Volume 2016, Article ID 6980943, 16 pages http://dx.doi.org/10.1155/2016/6980943