The summit area shows outcropping of the Kirkstile Formation. These Ordovician rocks, typical of the Skiddaw massif, are composed of laminated mudstone and siltstone. Low Bank lies across the Causey Pike Fault and is part of the Buttermere Formation, an olistostrome of disrupted sheared and folded mudstone, siltstone and sandstone. There are also two minor intrusions of basalt running across the ridgeline.