I've millions of points collected for lithology layer. They have used a coding for different types of rocks. I need to create a polygon around the extent of similar points. What is the easiest way to get the polygon rather than digitising manually. I was searching for tools that convert points to polygons but looks like there arent any. I've seen tools for converting line to polygons, polygons to lines and points but not for points to polygons. Your help in this regard is highly appreciated. Thank you.