Vertical Burrows

While many of the horizontal and 3-D traces reflect animals digging through the sediment looking for food, many of the vertical traces reflect burrows dug to provide a safe place to live. Ah, nothing like a hole of one's own!

This photo shows several layers of light gray shale separated by a rust-looking horizon from a dark gray shale. Coming down from the rusty horizon are a number of vertical burrows, which also look rusty. Ravenscar Group (Jurassic), Yorkshire, England
This shot looks down on the surface of a sedimentary layer. The various holds are the entrances to fossil burrows. The long and deep one to the left of the camera lens cap once housed a marine worm whose head came out one side and whose other end came out the other side. A similar burrow is shown in the image below.
To the lower left of the lens cap is a U-shaped burrow with a series of fine U-shaped connections between the two vertical uprights. The left-hand upright is not well-preserved. A marine worm with both ends sticking out once lived here. Along I-77 in West Virginia

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