List of erratics (updated December 2023)

We maintain a list of erratics found on the Quimper Peninsula during our Great Erratic Challenge of 2020 and added some updates (2022) at the large end. We added Pokorny’s Rock and Peregrine Rock to the original list of the biggest; below are pictures of each. We’ll update new giants as they are found and documented.  Here is the link to the current list (2023 Erratic List v5).  For a list of those who participated and the top ten (hat) 2020 winners, click here.

This is a gigantic erratic on the ridge above Tamanowas Rock in Anderson Lake State Park. Eric Nagle (finder) for scale (6 ft).  Longest dimension is 50 ft. Roughly 20 ft high, base not exposed (hence minimum thickness). The rock appears to be a metabasalt or gabbro from the north, not the Olympic Peninsula. The rock is alongside the trail from Tamanowas Rock to the northeast side of Anderson Lake. Easy access from the parking lot at Tamanowas Rock.  About a 1.5 mi roundtrip, takes 2 hours plus you want to see Tamanowas Rock, which is an adakite.


The second largest erratic (currently) is Pokorny’s Rock on the appropriately named Valley Rock Farm.  This erratic is owned by Mark and Tami Pokorny of Tarboo Valley, about 1 mi south of Hwy 104. The rock appears to be a metabasalt and is hard to approach since its surrounded by a thicket of Himalayan blackberry canes.  This is on private property, but can be seen in the valley bottom to the west from Dabob Road.


If you find an erratic more than 10 ft (3 m) long, please let us know and we’ll add it and the data to our list. Rock on!