Name: Mystery of the Channeled Scablands and the Two Detectives who Solved it.
Start: 2025-12-10T13:00:00-08:00
End: 2025-12-10T14:00:00-08:00
Location: Pomeroy Senior Center

November 2025
November 15 @ 9:30 am - 3:00 pm PST

Barker Canyon Giant Cave Arch Rockshelter Field Trip – Sat. Nov. 15th

Dry Falls Visitor Center 35661 HWY 17 North, Coulee City, WA, United States

Join Outing Coordinators Mark Amara, Geologist and Gene Wing of the Lower Grand Coulee Chapter on Saturday November 15th for a 3-mile hike to visit the Barker Canyon Giant Cave Arch Rock Shelter Ice Age Floods Feature in the Upper Grand Coulee Date: Saturday November 15th, 2025 Start time: 9:30 am Meeting Place: We will meet at the Dry Falls Visitors Center parking lot at 35661 Hwy 17 North, Coulee City, 99115 and plan to leave at 9:30 AM sharp and drive to Barker Canyon DRIVING DIRECTIONS: Please see the attached map or coordinates of the Rock Shelter are: 119.193029 degrees Latitude - 47.89900 degrees Longitude Fees: A Discover Pass is required What to bring: Lunch, drinks, snacks, appropriate clothing and footwear, camera, etc.
November 17 @ 7:00 pm - 8:30 pm PST

Puget Lobe Lecture: Jeff Tepper on the Initiation of the Cascade Arc

Bellevue College Building T Room 127 3000 Landerholm Cir SE, Bellevue, WA, United States

Dr. Jeff Tepper The Cascade volcanic chain, the world’s youngest continental arc, was “born” shortly after accretion of the Siletzia oceanic terrane ~50 My ago. That collision, which led to formation of the Olympics, terminated the earlier subduction system and caused a portion of the subducting Farallon slab to break off. When Cascade magmatism began less than 5 My later, there was a new trench located outboard of Siletzia. In this talk I will present a new model, based on petrology, geochronology, plate motion reconstructions, and mantle tomography, that explains how subduction was initiated so quickly and in a setting where the slab was young and hot and in theory too buoyant to subduct.
December 2025
December 9 @ 7:00 pm - 8:30 pm PST

Foster Creek and Foster Coulee: Insights on Ice Age Floods, Glaciers, and Lakes on the Waterville Plateau, WA

Wenatchee Valley Museum and Cultural Center 127 S. Mission, Wenatchee, WA, United States

The Wenatchee Valley Erratics Chapter of the Ice Age Floods Institute will meet Tuesday, December 9 at 7:00 PM, at the Wenatchee Valley Museum and Cultural Center, 127 S. Mission, Wenatchee. Or via Zoom link: https://us02web.zoom.us/j/81855547958 Meeting ID: 818 5554 7958 Karl Lillquist will give our final live, and Zoom, presentation for 2025. Karl is a physical geographer, who taught at Central Washington University until his retirement in summer of 2024. He will talk about “Foster Creek and Foster Coulee: Insights on Ice Age Floods, Glaciers, and Lakes on the Waterville Plateau, WA.” Please note! The Wenatchee Valley Erratics now has its own website: https://wverratics.org/ !

Free
December 10 @ 1:00 pm - 2:00 pm PST

Mystery of the Channeled Scablands and the Two Detectives who Solved it.

Pomeroy Senior Center 695 Main St., Pomeroy, WA, United States

The unique landscape of the Channeled Scablands was a mystery that baffled the first geologists who visited them over 100 years ago. Finding clues, they unraveled the mystery that was unbelievable to their colleagues. After more than two decades of discovering more clues, the theory that enormous floods had carved the scabland was finally accepted by most of the scientific community. Lloyd Stoess, President of the Palouse Falls Chapter, will take you on a journey following these two early detectives and the clues they found as well as what today's detectives and the modern tools they are using to better understand our incredible landscape.

Free

November 2025

Barker Canyon Giant Cave Arch Rockshelter Field Trip – Sat. Nov. 15th

Puget Lobe Lecture: Jeff Tepper on the Initiation of the Cascade Arc

December 2025

Foster Creek and Foster Coulee: Insights on Ice Age Floods, Glaciers, and Lakes on the Waterville Plateau, WA

Mystery of the Channeled Scablands and the Two Detectives who Solved it.

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