A liquid has definite size(or volume) but indefinite shape. for example, milk is liquid. it takes the shape of its container but it’s volume remains the same irrespective of the size of the container. the particles of a liquid are not as closely packed as those solid.
Keeping in mind the description of the stone point given in the story, we can state Marshall the rancher was looking at a Folsom point.
As it's known, a Folsom is a kind of stone point with a leaf-like shape which has a concave base and wide, shallow grooves/flutes running almost the entire length of the point.
