Devices for marking a core sample

A device for guiding a user to mark a core sample carried by a core tube, the core tube associated with a downhole tool configured to record data relating to the orientation of the core sample in situ, prior to or immediately after being broken from bedrock, the core sample defining a longitudinal axis between opposed ends, the device including:

• a housing having a marking guide configured to be arranged, in use, adjacent at least one of an end and side of the core sample, the housing being mountable relative to the core sample or the core tube to allow relative rotation of the marking guide and the core sample about the longitudinal axis of the core sample;
• a communications module carried by the housing and operable to communicate with the downhole tool to receive data;
• a user interface carried by the housing and operable to convey perceptible feedback to the user;
• and
• a processor and associated memory carried by the housing, the processor communicatively coupled to the communications module and the user interface, and configured to store the data in the memory,
• the processor further configured to determine a marking position based on the data, and operate the user interface to direct the user to cause relative rotation of the marking guide and the core sample so that the marking guide is aligned with the marking position, thereby allowing the user to use the marking guide to mark the core sample at the marking position.