Volume 7 2020 © 2020 Utah Geological Association. All rights reserved. For permission to copy and distribute, see the following page or visit the UGA website at www.utahgeology.org for information. Email inquiries to GIW@utahgeology.org. RHYOLITE IGNIMBRITE BOULDERS AND COBBLES IN THE MIDDLE JURASSIC CARMEL FORMATION OF UTAH AND ARIZONA—AGE, COMPOSITION, TRANSPORT, AND STRATIGRAPHIC SETTING Bart J. Kowallis, Douglas A. Sprinkel, Eric H Christiansen, Skylor Steed, and David F. Wheatley