On the precipice: orange lichen
A tiny orange lichen growing on the tip of a gray rock, making it appear as though they're growing on the edge of a cliff. The lichen's thalli appear to be tiny (less than 1mm across). I believe this may be in _Caloplaca_ (_Caloplaca holocarpa_ or _Caloplaca lithophila_?) or possibly _Xanthoria_, but I'm not certain. This lichen was found in Vasquez Rocks County Park in Los Angeles County. The scale bar is 5mm (contact me if you want a version of the image without the scale bar).