The bedrock of Squak Mountain is made up of rocks that formed from sediments carried by rivers into an ancient coastal estuary, where their increasing weight caused the land to sink, only to be buried by even more sediments. In time, the sedimentary layers accumulated more than one mile of thickness. As the sediments slowly collected, sub-tropical forests flourished on the landscape. Trees died and were buried before they began to decay, slowly converting into peat. Further burial and heat, possibly from regional molten magma intrusions in the Cascade Mountains, reduced the water, methane and carbon dioxide in the peat, and changed it into coal. The coal seams are found today in a layer of sedimentary rocks that geologists have named the Renton Formation.

bedrock of

Lotus corniculatus L. (plants.sc.egov.usda.gov) Birdsfoot trefoil is a moderately long-lived herbaceous perennial legume. It has a well developed, branching, tap-like root with side roots near the soil surface. Most cultivars are erect and grow to a height of 2 to 3 feet. The stems are slender, branch well, and are moderately leafy. Leaves are smooth and consist of 5 leaflets. The bloom is made up of a cluster of bright yellow flowers arranged in a whorl at the end of the flowering stems. When ripe, the brown seed pods extend outward from the stalk and look like a bird’s foot. The plant remains green and succulent during and after seed ripening. There are an average of 375,000 seeds per pound.

Squak Mountain State Park History (parks.wa.gov) A generous land donation and the hard work of community activists has ensured that Squak Mountain State Park will be an enduring piece of wilderness close to the homes of millions of urban residents.