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Stratigraphy of the Jajarkot nappe: finding the rocks of the Tethys province

Lamsal Sunil, Paudyal Kabi Raj

Geotourism / Geoturystyka

2023

nr 1-2 (72-73)

41--41

There are several thrust sheets in the Lesser Himalayan region of Nepal. The Jajarkot nappe is one of them. It is located immediately west of the Kahun Klippe and east of the Karnali Nappe. There is no unified stratigraphy established for this thrust sheet. In the present research, an attempt was made to establish the stratigraphy of the Jajarkot nappe to fulfill the research gap. Previously described by Fuchs & Frank (1970) and Sharma (1980), the Jajarkot nappe in western Nepal have two distinctive crystalline lithological units: the Chaurjhari Formation and Thabang Formation. The previous unit consists of garnet-grade schist, and quartzites, with intrusions of basic rocks and granites, while the later unit consists of grey to brown crystalline limestones with biotite-quartz-schists. An unconformity is observed above the Thabang Formation. The younger geological unit above the unconformity is mapped as the Jaljala Formation, which is composed of finegrained calcareous sandstone and calcareous siltstone with minor proportions of limestones and grey-green slates. At present work, a preliminary geological study was carried out to work on the stratigraphy of the Jajarkot nappe in the Jaljala areas at 1:25,000 scales. Fossils of crinoids are found in the rock unit of the Jaljala Formation. These fossils are considered the index fossils of the Silurian. In this case, the Jaljala Formation would be equivalent to the rocks of the Tethyan affinity, and further study is under progress. The concept that the thrust sheets are moved from north to south in the Himalayas will be evidenced by these findings. An attempt is made to correlate the presently found fossils with the crinoids of the Phulchauki Group of the Kathmandu nappe and with the root zone of the Tethys succession.

Inventory of geotouristic routes along the southern hills of the Kathmandu Valley

Acharya Manjari, Paudyal Kabi Raj

Geotourism / Geoturystyka

2021

nr 3-4 (66-67)

47--61

An inventory map of geotouristic sites was prepared on the scale of 1 : 25 000 along the Chandragiri-Chitlang Range, southwestern part of the Kathmandu Valley of central Nepal. From the ridges and peaks of the Chandragiri-Chitlang range, visitors can witness breathtaking views of the surrounding hills, modern buildings, and ancient temples of the Kathmandu Valley from a distance. The objective of the study was to explore the geotouristic sites around the Kathmandu Valley. For this purpose, all the available information related to geology, environment, geography, culture, religion, and other touristic components was reviewed thoroughly, and extensive fieldwork was carried out with the purpose of geological mapping and data collection. The Chandragiri-Chitlang range is a renowned place and open book not only for geologists but also for the nature lover, climbers, trekkers, photographers, videographers, cultural tourists, biologists, and ayurvedic and it has a great prospect for tourism due to its geomorphological variation, unique geological features, beautiful natural scene, unique trekking trails, culture, biodiversity, adventurous way, heritage, and historical sites. Major geotouristic sites, which attract tourists throughout the year in this range are the lush green Chandragiri Hill, Chandragiri Temple with children’s playground and exciting recreational equipment, snowfall, on the winter season, Chitlang Homestay, Chobhar Hill, Taudaha natural pond, Pharping Hill, Champadevi Temple, Gupteshwor cave, Chobhar cave, Thankot, and Matatirtha Temple, etc. Geologically, the study area comprises the lower four geological units of the Phulchoki Group of the Kathmandu Complex from older to younger sequences i.e. the Tistung Formation, the Sopyang Formation, the Chandragiri Limestone, and the Chitlang Formation along with alluvial fan deposits and Kathmandu Lake sediments. The basin of Kathmandu is filled with the lacustrine-fluvial deposits of ancient lakes followed by river deposits. The Chandragiri Thrust, Chitlang Syncline, Kirtipur Anticline are the major regional-scale geological structures within the study area. Unique oldfashioned footrail attracts tourists and increased the charm of traveling in this place. The homestays in Chitlang village, joyful of culture and environment, provide a tranquil retreat away from the bustling crowds of Kathmandu. Preparation of a tourist guidebook and planning and development from the perspective of a geotouristic approach is recommended after this research. Reconstruction and establishment of trekking foot trails and tourist information centers based on currently available natural and human resources without investing high costs can be carried out for sustainable tourism development in this range.