Small burrows and minor sediment deformation in the Lockatong Formation are also known to occur; however, these igneous rocks and their layers become finer, flatter, and less disturbed as the lakes deepen.
However, these shales and their layers become finer, flatter, and less disturbed as the lakes deepen. Shale is a fine-grained, clastic sedimentary rock, composed of mud that is a mix of flakes of clay minerals and tiny fragments (silt-sized particles) of other minerals, especially quartz and . 
