A sequence of rocks consisting of deep-sea marine sediments overlying a range of igneous phenomena, including basalts and dykes. Ophiolite sequences are indicators of sea-floor spreading, as tectonic movements pull and thin the crust, allowing magma to rise up and create new crust. When the magma is cooled by the sea water, it forms a variety of igneous rocks and structures. See Saha et al. (2010) J. Earth Sys. Sci. 119, 3, 365 on a completely preserved ophiolite suite from South Andaman, India.