VIRTUAL FIELD TRIP # 4 Deep Water Turbidites in the Ouachita Mountains, Arkansas Lafayette Geological Society Field Trip March 16 - 18, 2001          Our virtual fieldtrip is based upon "Field Guide to Deep Water Turbidites in the Ouachita Mountains, Arkansas" by Martin Link (Reservoirs, Inc.), Charles Stone (Arkansas Geological Commission), Barry Wawak (Core Petrophysics, Inc.), Ron Cormier (Core Petrophysics, Inc.). Click for larger view. Group photo at Pinnacle Mountain. The field trip routes us through seven Jackfork Formation (Pennsylvanian--Morrowan) exposures and one Stanley Formation (Mississippian) exposure of Carboniferous deep-water, fine-grained turbidites in the southeastern Ouachita Mountains of Arkansas. Jackfork sites include DeGray Spillway, Hollywood Quarry, Souther Quarry, Kirby Quarry, McCain Mall in North Little Rock, Big Rock Quarry in North Little Rock, and Pinnacle Mountain State Park. The roadcut through the Stanley Formation (Mississippian--Chesterian) at the McLeod Exit, Martin Luther King Expressway, Hot Springs, affords us an opportunity to examine a mud-dominated sequence of turbidite sediments in a series of distal, layered, thin-bedded, fine-grained sand sheets . Virtual  Fieldtrip  Stops Fieldtrip Organizers DeGray Spillway, Part I DeGray Spillway, Part II DeGray Spillway, Part III Hollywood Quarry, Part I Hollywood Quarry, Part II Souther Quarry Kirby Quarry MLK Roadcut, Hot Springs McCain Mall Big Rock Quarry, Part I Big Rock Quarry, Part II Big Rock Quarry, Part III Pinnacle Mtn. State Park Click for Larger View. Arkansas Jackfork Outcrops with Approximate Field Trip Sites.   Arkansas: Structural/Stratigraphic Maps & Sections Jackfork Outcrops, Paleocurrents, and Field Trip Sites. Paleogeography of Stanley and Jackfork. Stratigraphic Correlation Chart, Mississippian and Pennsylvanian Formations. Sediment Sources for the Jackfork Formation. The Ouachita Orogenic Belt. Geologic Map of the Ouachita Mountains. Paleozoic Units, Ouachita Mts. De Gray Dam Spillway section, from Brian E. Lock, 1978 SACGS guidebook. The sections and maps above have been reproduced from the numerous field guides published by the Arkansas Geological Commission and from Brian Lock's drawings for the 1978 SACGS Guidebook. Special thanks go to BRIAN LOCK and MYRA HAMBURN and BARRY WAWAK for the use of their excellent fieldtrip photographs. Additionally, without MYRA'S identification of photo locations, the virtual fieldtrip could not have been compiled. Lafayette Geological Society thanks CORE LAB PETROLEUM SERVICES, STONE ENERGY, and STRATAGRAPH, INC. for printing the Fieldtrip Guide Book & STONE ENERGY for providing beverages and the use of their parking lot. LINKS: Arkansas Relief Map Arkansas, 'Rockhounding Arkansas'    Excellent info about Arkansas mineralogy and Magnet Cove; succinct geological history of Arkansas Arkansas, Arkansas Geological Commission Bauxite, Arkansas: A Page from the Past Field Tripping in Arkansas: Diamonds, Hot Springs, and Quartz Crystals Hot Springs, Arkansas    Excellent info about the geology of Hot Springs. Thermal Waters of Hot Springs   Web Author: Karen W. Broussard