A very diverse pile of water-worn river rocks, mostly, with a couple things that might be hardened clay, and then the one in the centre that looks like a sort of man-made melted slag, but nothin that stands out as bein possibly meteoritic in origin from what I can see.
A good start for your next landscape project. Check some basic geology videos on youtube as that will cut down on the leaverites and meteorwrongs. Put a good magnet on a stick, or invest in even a cheap detector will help identify meteorites. Water is bad for meteorites, not a place I would look.