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All Seasons

Season 1

  • S01E01 Yakima River Canyon

    • December 28, 2017

    The majestic river canyon meanders across the central Washington desert — apparently blasting directly through three large ridges. What came first? The river or the rock?

  • S01E02 Mount Stuart — From Mexico?

    • December 28, 2017

    The Stuart Range near Leavenworth is one of the most beautiful mountains in all of the American West — and yet its granite contains clues that continue to puzzle geologists. Did the granite really form in Mexico and move a thousand miles north to central Washington?

  • S01E03 Liberty Gold Mines

    • December 28, 2017

    Washington’s gold rush isn’t over. Find out how gold came to Washington and where active mines still produce gold — if you know how to find it.

  • S01E04 Mt. Rainier’s Osceola Mudflow

    • December 28, 2017

    5,600 years ago, a Mt. Rainier eruption sent a wall of mud careening down the White River Valley to Tacoma. The Osceola Mudflow created the Enumclaw Plain by burying a formerly rugged Puget Lowland with hundreds of feet of volcanic mud — a plain now home to over 500,000 people.

  • S01E05 Giant Lava Flows

    • December 28, 2017

    Some of the largest lava flows in the world can be found in the deserts of Eastern Washington. The massive lavas erupted from giant cracks that can still be found today, if you know where to look.

  • S01E06 Dry Falls

    • December 28, 2017

    One of the largest waterfalls in the history of Earth happened in Washington state. Three-times the width of Niagara, the volume of the Ige Age falls was 10-times the combined flow of all the rivers on Earth.

Season 2

  • S02E01 Seattle Fault

    • December 28, 2017

    The Seattle Fault, discovered in the 1990s, runs right beneath downtown and out to Bainbridge Island. When did the fault last produce a large earthquake? What is Seattle doing to prepare for the next one?

  • S02E02 Columns of Basalt Lava

    • December 28, 2017

    Spectacular rock columns are on display throughout the deserts of eastern Washington. How do these crazy stone pillars form? How old are they?

  • S02E03 Chasing Ancient Rivers

    • December 28, 2017

    Is it true that the Columbia River has had many different paths throughout its long history? Yes. What does the evidence look like? Did the Yakima and Salmon Rivers shift around too?

  • S02E04 Lake Chelan — Battle of the Ice Sheets

    • December 28, 2017

    Scenic Lake Chelan is a vacation paradise that was created during the Ice Age. But how can geologists prove that an ice sheet from Canada did the digging?

  • S02E05 Bridge of the Gods Landslide

    • December 28, 2017

    When did a mountain in Washington split and slide to Oregon in the Columbia River Gorge? Why did it happen — and will it happen again?

  • S02E06 Ancient Cascades Volcanoes

    • December 28, 2017

    Geologists have found places in the Cascades where Mount Rainier-like volcanoes once stood, but the ancient volcanoes are now gone. What are the clues to find the ghost volcanoes?

Season 3

  • S03E01 Ice Age Mystery of Lake Lewis

    • January 29, 2019

    Follow the trail that led geologists to find an ancient lake that submerged much of eastern Washington under 1200 feet of water in the Ice Age. Where did the lake come from and where did it go?

  • S03E02 Steamboat in the Desert

    • January 29, 2019

    How did giant Steamboat Rock survive the powerful Ice Age forces that formed the Grand Coulee? Find out how ancient ice sheets and catastrophic floods carved one of the Northwest’s most iconic monuments.

  • S03E03 Goldilocks Miracle of the Palouse

    • January 29, 2019

    Discover the Ice Age secret locked in the rich depths of the Palouse. Long thought to be “volcanic” soil, the real story begins instead with the rupture of Ice Age dams.

  • S03E04 Puget Sound's Exotic Terranes

    • January 29, 2019

    From the Deception Pass bridge you can see all the way to Mexico— but only if you look down. Learn how the exotic rock from the age of the dinosaurs made its way up the West Coast to the Salish Sea.

  • S03E05 Ghost Forests

    • January 29, 2019

    The record of the Northwest’s last cataclysmic earthquake is buried in the mud with only ancient trees to tell the story above ground. Follow the trail of the quake that dropped the coastline six feet and pushed a mega-wave all the way to Japan.

  • S03E06 Giant Ripples in the Scablands

    • January 29, 2019

    The fingerprints of rushing water rise from the desert as huge ripples of rocks. The patterns tell a story of the speed, depth, and breadth of the last major Ice Age Flood that surged down the Columbia River and carved the gorge at the famous Gorge Amphitheatre.

Season 4

  • S04E01 Smith Rock Caldera

    • January 28, 2020

    This Oregon landmark is now traced back to super-volcanic explosions related to the Yellowstone Hot Spot.

  • S04E02 Saddle Mountains Buried in Ash

    • January 28, 2020

    Thirty feet of volcanic ash in Washington’s Saddle Mountains fell out of the sky from a Super Volcano explosion south of Boise, Idaho.

  • S04E03 Teanaway Tropics

    • January 28, 2020

    Palm trees in the center of Washington state? Yes, if you’re willing to go back 55 million years, when the Northwest was hot and humid.

  • S04E04 Scraping Together Mt Olympus

    • January 28, 2020

    This gorgeous mountain is not volcanic, but the accumulation of millions of years of ocean sediment pushed into a dazzling mountain range.

  • S04E05 Ape Cave

    • January 28, 2020

    We’ll explore the third longest lava tube in the nation. Red hot lava built this cave during a massive explosion on Mt St Helens 2000 years ago.

  • S04E06 Mt St Helens Crater

    • January 28, 2020

    Fly into the 1980 crater of Mt. St. Helens and learn how volcanic forces are building a new lava dome as geologists train for the next volcanic eruption around the Pacific Rim.

Season 5

  • S05E01 The Labyrinthine Canyons of Drumheller Channels

    • December 8, 2023

    Outside Othello, Washington, a labyrinth of canyons conjure images of the desert Southwest, but these channels weren’t carved by rivers. Join local geologist Nick Zentner as he examines the surreal landscape of Drumheller Channels for evidence of massive Ice Age floods.

  • S05E02 The Spires of Saddle Rock

    • December 15, 2023

    Journey with Nick Zentner high above the city of Wenatchee, Washington, where a group of spires made of a unique type of 44-million-year-old rock tell the story of extreme volcanic activity and ancient vents of magma older than the Cascade volcanoes.

  • S05E03 The Canyons of Moses Coulee

    • December 22, 2023

    The story of Moses Coulee is a tale of two canyons. Geologists believe the canyon was created by Ice Age floods just 16,000 years ago - but the ghostly hanging valleys on the canyon walls tell a different story.

  • S05E04 How Did Big Four Mountain Form?

    • December 29, 2023

    There’s a basic rule in geology: Sedimentary rock layers build up horizontally. So how did the slabs of Big Four Mountain in Western Washington end up with nearly vertical layers, tilted 82 degrees away from their original positions?

  • S05E05 How Mount Shuksan Got Its Green Top

    • January 5, 2024

    Greenschist is a special type of rock that gets its green tint from minerals compressed long ago deep under the ocean. Join Nick as he explores how the entire top of mighty Mount Shuksan is made of this unique green stone.

  • S05E06 The Many Volcanoes of Mount Baker

    • January 12, 2024

    Over thousands of years, the glaciers of Mount Baker carved away rock to reveal a surprising history: Not just one, but three ancient and distinct volcanoes have lived and died in the volcanic field over the past million years.

  • S05E07 The Oldest Bedrock in the North Cascades

    • January 19, 2024

    The oldest bedrock in all of the North Cascades sits high in the mountains near the Canadian border. Its origin story began over 400 million years ago and an ocean away - in Northern Europe.

  • S05E08 The Mysterious Boulders of Waterville Plateau

    • January 26, 2024

    Just north of Withrow, Washington, the pancake-flat farms and fields are dotted by massive mysterious basalt boulders. These rocks, picked up and moved by ice sheets in the last Ice Age, help Nick visualize the moraine of a giant bygone glacier.

Season 6

  • S06E01 Record of a Massive Glacier in Anacortes

    • December 5, 2024

    Sitting right on the edge of the Columbia River near Vancouver, Washington, Beacon Rock shoots 800 feet straight up from the valley floor. While it’s made of the same type of rock as the gorge’s surrounding walls, it tells a much newer story.

  • S06E02 The Massive Mudflows of Glacier Peak Volcano

    • December 12, 2024

    Glacier Peak is Washington's most remote stratovolcano, towering high in the Cascade Mountains some 50 miles from the waters of Puget Sound. But in the not-so-distant past, eruptions from this volcano sent huge mudflows all the way down to the Skagit Flats - and it could happen again.

  • S06E03 Discovering Ancient Lakes at Potholes Coulee

    • December 19, 2024

    Just north of the famous Gorge Amphitheater are two enormous lake-filled canyons that appear to feed into the Columbia River. But the canyons of Potholes Coulee weren’t carved by rivers, and the lakes at the valley floor might not be so ancient after all.

  • S06E04 The Secret Summit of Mount Index

    • December 26, 2024

    Index granite was used to build the iconic Smith Tower in Seattle, and is known by climbers all over the world for its grippy quality. And while Mount Index consists mostly of the famous granite that shares its name, its peak is made of much older and more mysterious rock.

  • S06E05 The Ice Age Story of Pateros, Washington

    • January 2, 2025

    The town of Pateros, Washington, sits at the confluence of the Methow and Columbia Rivers in a landscape that has been dramatically shaped by ice and water over the past 20,000 years, including a terrace that mystifies geologists to this day.

  • S06E06 The Giant Ice Sheet That Shaped Seattle

    • January 9, 2025

    From the hills and ridges that all run north to south to the huge freshwater lakes that define the region, the geography of Seattle is a direct result of a giant ice sheet that scoured the landscape just 16,000 years ago.

  • S06E07 The Remains of an Ancient Volcano at Beacon Rock

    • January 16, 2025

    Sitting right on the edge of the Columbia River near Vancouver, Washington, Beacon Rock shoots 800 feet straight up from the valley floor. While it’s made of the same type of rock as the gorge’s surrounding walls, it tells a much newer story.

  • S06E08 The Granite Peaks of Washington Pass

    • January 23, 2025

    Towering walls of granite stand sentinel over Highway 20 at Washington Pass deep in the North Cascades. The surrounding peaks are made of two distinct types of granite that formed far away from each other before dramatically colliding in the Northwest.