of the comet-shaped flute is rarely longer than ten centimeters, and the imprints are generally shallow. Asymmetrical flute casts are formed on top of a neighboring cast, and, therefore, covers half or more of the underlying flute. As the flutes continue to build outward in a step-like fashion and cut into each other, they get smaller and shallower. Tool marks Tool marks are a type of sole marking formed by grooves left in a bed by things like sticks being dragged along by a current. The average direction of these can be assumed to be the flow direction, though it is bidirectional, so it could be either way along the mark. Tool marks also have a more specific breakdown. There are grooves and striations, skip or prod marks, and roll marks. Groove or striation marks result from the continuous contact with the muddy bed. Skip or prod marks come from objects that bounce along the surface of the muddy bed. And roll marks result from objects rolling along the muddy bed. A skip mark is part of a series of linear tool marks left by an object that skipped along the bottom of a stream by saltation. Skip marks are characterized by their even spacing and the crescent-shaped mark that is left on the bed. The skip marks run parallel to paleoflow. Saltation is a method of sediment transport that briefly suspends particles and then drops them creating a forward bouncing pattern. This occurs because the turbulent currents are not strong enough to maintain suspension of the particles, but strong enough to suspend the particle for short bursts of time before the particle is returned to the sediment surface and bounces off again. A prod mark is a relatively short tool mark caused by an object that was dug into the muddy sediment and then lifted out. These markings are generally asymmetrical, getting deeper down current, and end suddenly. Roll marks are made by an object that was forced to roll down the bottom of a stream. The marks made in this case are continuous, long, generally linear, and run parallel to the paleoflow. The width dimensions of roll marks vary based upon the size of the object. Roll marks are a sign of water that has enough energy to cause motion but not enough turbidity and energy to separate the object from the bottom of a muddy bed. Groove