From the National Park Service, on the history of the Santa Clara Valley:
"The Santa Cruz Mountains and Diablo Mountain Range created a sheltered valley. Located south of the San Francisco Bay, Santa Clara Valley offered shelter from the cold, damp climate of the San Francisco region and coastal areas west of the Santa Cruz Mountains, and was no doubt inviting to the first human inhabitants. Historically, the Tamien-speaking Ohlone Indians were the first documented inhabitants of the Santa Clara Valley region, although the oak lined hills and valley undoubtedly had known earlier Indian inhabitants and migrations, now lost to history and prehistory. Archeological discoveries place Ohlone Indian settlements in the region as early as 8000 BC."
I look at this rock, with it's "Ohlone Food Processor" mortars carved into it, and imagine three or four Ohlone women sitting around it, chatting, as they grind their acorns...thousands of years ago!
What do you think they were talking about?