The youngest of these types of deposits is the approximately 1,300 year old Paulina Lake pyroclastic flow. Two campgrounds are located on that deposit, which can be found along the southern shore of Paulina Lake. These infrequent but extraordinarily hot and fast moving flows would travel quickly down the slopes of Newberry and be very destructive.

Larger dark lava bombs were carried in the pyroclastic flow supported within the ashy matrix (Credit: Donnelly-Nolan, Julie M.. Public domain.)

Weathering has eroded the deposit into rounded mounds. Hammer hanging from outcrop in foreground is present for scale. (Credit: Donnelly-Nolan, Julie M.. Public domain.)