"Carmel Valley is intimately tied to the Carmel River. Starting from the bottom of the outcrop, two distinct types of rocks are evident. First, the lowest layer is the Monterey Formation seen throughout the area. This layer forms in deep marine basins far from continental shelves.
The following layers, the large cobbles with a sandstone like layer separating the individual repeats, gives us clues about the origin of these rocks. Being well rounded and having a variety of sizes, we can compare these cobbles to those that we might currently find in the Carmel River."
From: Geocaching Carmel Valley
http://www.geocaching.com/seek/cache_details.aspx?guid=6de6d451-ab37-4268-b29f-74f4acc7c056
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