The group lies 1.9 kilometres (1 nmi) northwest of Cape Tuxen, Graham Land.

The rocks observed on the Yalours and surrounding areas are predominantly igneous intrusives that have cooled deep under ground.

This process, called orogenesis, is one of the most common ways for a mountain chain to form.

The Andres and the coast ranges of North America are other classic examples of this type of tectonism.

The mountain building has nearly stopped though; it is only at the very tip of the peninsula and in the South Shetland Islands that the process continues.