Kollam is a city in the state of Kerala, on India's Malabar Coast. It’s known as a trade hub and for its beaches, like lively Kollam and secluded Thirumullavaram. Sardar Vallabhbhai Patel Police Museum has artifacts tracing the history of the police force. Nearby, Ashtamudi Lake is a gateway to the Kerala backwaters, a network of waterways rich with vegetation. The striped 1902 Tangasseri Lighthouse has ocean views. Varkala is a coastal city and municipality in Thiruvananthapuram metropolitan area of Thiruvananthapuram district situated in the Indian state of Kerala.City is located 29 kilometres north-west of Thiruvananthapuram (Trivandrum) and 37 km south-west of Kollam.Varkala MaithanamVarkala cliffsVarkala is the only place in southern Kerala where cliffs are found adjacent to the Arabian Sea. These Cenozoic sedimentary formation cliffs are a unique geological feature on the otherwise flat Kerala coast, and is known among geologists as Varkala Formation and a geological monument as declared by the Geological Survey of India. There are numerous water spouts and spas on the sides of these cliffs. In 2015, Ministry of Mines, Government of India and Geological Survey of India (GSI) have declared Varkala Cliff as a geo-heritage site.Varkala is an important place as far as Kerala Geology is concerned as it exposes sedimentary rocks belonging to the Cenozoic age, popularly known in the Geological literature as the Warkalli formation. Warkalli formation along with Quilon formation represents sediments laid down in the Kerala basin that existed during the Mio-pliocene times. Quilon formation of Miocene age is made up of limestones and the type area is Padappakara near Kollam (Same as Quilon) and the Warkalli formation of Mio-pliocene age (type area is Varkala) is made up of alternating beds of sands and shales exposed along the Varkala cliffs. Thin seams of lignite in the shales of the Warkalli formation suggests good vegetation at the time of deposition of the clayey sediments.