FIELD TRIPS Jerry King led the discussion at the field trip destination: a large, tilted cylindrical mass of cemented fine sand over a meter wide and several meters long, exposed through erosion of the eastern Lovell Wash sidewall (see photo on the cover). The cylindrical mass was oriented approximately perpendicular to the Bitter Ridge Limestone bedding and had a flat top, which was concordant with overlying limestone layers (see Photo 1, previous page). This feature is interpreted to be a sand dike formed through earthquake-induced liquefaction of saturated, shallow sand layer(s) underlying the limestone. Increases in water pressure due to collapse of the sand structure during shaking are thought to have initiated forced flow upward through the overlying limestone layers. The vertical flow path likely enlarged through the process, leaving behind the massive, sand-filled conduit. A “volcano” of unconsolidated sand on the former lake bottom would have probably resulted, however it is thought to have eroded away prior to subsequent limestone deposition. The size of the Lovell Wash sand dike suggests it may have formed due to a strong earthquake. Following the official close of the field trip, many of the participants continued up Lovell Wash an additional few hundred meters to hike through one of the most spectacular slot canyons in Southern Nevada, the Anniversary Narrows (see Photo 2), serving as an adventurous conclusion to a morning filled with camaraderie, inspiring geologic scenery, and stimulating discussions.
e h t s e e v t Sa Da …for These Future AEG Events Photo 2. The Anniversary Narrows
PHOTO BY LOUIE HENDRICKX
AEG/USSD Workshop
AEG 2023 Annual Meeting
Westin Fort Lauderdale Beach Resort
Portland Marriott Downtown Waterfront – Portland, Oregon
December 6–8, 2021 This workshop will focus on Best Practices in Specialty Geotechnical Construction Techniques for Dam Exploration and Remediation. Information will be posted soon on www.aegmeetings.org.
AEG 2022 Annual Meeting Planet Hollywood Resort – Las Vegas, Nevada September 13–17 Your fun begins on The Strip, Las Vegas’ main artery and home to bustling casinos, world-class restaurants, ornately designed resorts and over-the-top shows. Overlooking the Las Vegas Strip, our Annual Meeting hotel—Planet Hollywood Resort—is in the middle of everything you will want to experience. This Annual Meeting will be exciting, educational, and a great opportunity to reconnect with your colleagues and meet new ones.
32
September 19–24 Portland sits on the Columbia and Willamette rivers, in the shadow of snow-capped Mount Hood. It’s known for its parks, bridges, and bicycle paths, as well as for its eco-friendliness and its microbreweries and coffeehouses. The city hosts thriving art, theater, and music scenes. Surrounded by Portland hot spots, the Marriott Portland Downtown Waterfront hotel reflects the vibrancy of the city and is located directly on the waterfront in downtown, surrounded by more than 60 breweries. Wind down with friends by sampling some of the 150 types of whiskey at their on-site restaurant, Proof Reader. The hotel even helps you go green with complimentary car-charging stations, biodegradable straws and easy access to light rail from the nearby Morrison Subway Station. At night, retire to elevated guest rooms with 24-hour room service, waterfall showers, free Wi-Fi, premium channels and views of Portland. Don’t miss all of the exciting Field Courses, Guest Tours and the Special Event at the Oswago Hills Vineyard planned for this incredible Annual Meeting.
AEG NEWS 64(2)
Spring 2021
