Section 37.4 - Definitions(a)Authorized officer means the agency employee delegated the authority to perform the duties described in this part.(b)Cave means any naturally occurring void, cavity, recess, or system of interconnected passages beneath the surface of the earth or within a cliff or ledge, including any cave resource therein, and which is large enough to permit a person to enter, whether the entrance is excavated or naturally formed. Such term shall include any natural pit, sinkhole, or other feature that is an extension of a cave entrance or which is an integral part of the cave.(c)Cave resources means any materials or substances occurring in caves on Federal lands, including, but not limited to, biotic, cultural, mineralogic, paleontologic, geologic, and hydrologic resources.(d)Federal lands, as defined in the Federal Cave Resources Protection Act, means lands the fee title to which is owned by the United States and administered by the Secretary of the Interior.(e)Secretary means the Secretary of the Interior.(f)Significant cave means a cave located on Federal lands that has been determined to meet the criteria in § 37.11(c) .