1 Overnight temperatures are generally quite mild with an average low of 11.4 Â°C (52.5 Â°F). 2  The mean diurnal temperature variation/ range in July is 7.5 Â°C (13.5 Â°F).  The weather in July is slightly dry with rain periodically. Only 50mm (2in) of H2O is deposited across an average of 17 days.
Chemical sedimentary rock forms when mineral constituents in solution become supersaturated and inorganically precipitate. Common chemical sedimentary rocks include oolitic limestone and rocks composed of evaporite minerals such as halite (rock salt), sylvite, barite and gypsum.
Chemical sedimentary rocks form when masses of intergrown mineral crystals precipitate from solution (e.g. limestones, cherts). Organic sedimentary rocks have a high proportion of fragments of shells, carbon, plants or any other organic remains. Texture is the description of asedimentary rockâs constituent parts and their sizes, shapes, and arrangement.