Geology of Table Rocks

Larry Broeker, a retired geologist at Umpqua National Forest, will discuss the geology, geomorphology, and geoecology of the Table Rocks located in Jackson County north of Central Point.

Around 7 million years ago, a massive outpouring of runny lava swept down the ancestral canyon of the Rogue River 44 miles from source fissure(s) thought to be buried beneath Olson Mountain, an extinct High Cascades shield volcano located a few miles east-southeast of Lost Creek Lake.

The lava spread across the northern part of the Rogue Valley and solidified to a depth varying between 100 and 200 feet.

Over the past seven millennia, tectonic forces and geologic processes have imperceptibly transformed the Rogue Valley into the present-day iconic horseshoe-shaped landforms of Table Rocks.

You may also like the following events from Roseburg Public Library:

• This Tuesday, 12th August, 10:00 am, Kids Grab-and-Go Craft Kits in Roseburg
• This Tuesday, 12th August, 01:00 pm, Summer Reading Program Kids Activities in Roseburg
• This Wednesday, 13th August, 01:30 am, Online Book Group in Roseburg, Oregon