Exhibit 23(a) INDEPENDENT AUDITOR'S CONSENT We consent to the incorporation by reference in Registration Statements No. 333-22655 of Union Pacific Resources Group Inc. on Form S-3 and Nos. 333-22613 and 333-35641 of Union Pacific Resources Group Inc. on Form S-8, of our report dated January 26, 1998 appearing in this Annual Report on Form 10-K of Union Pacific Resources Group Inc. for the year ended December 31, 1997. DELOITTE & TOUCHE, LLP Fort Worth, Texas March 26, 1998