SearchResearch Challenge (7/24/24): Can you find the shellmounds?

 Some ancient constructions are not made of stone... 

Shellmound in Emeryville, CA, party torn apart. From Publications in American Archaeology and
Ethnography Journal, V 23 (1926)

... but are giant piles of debris.  Throughout much of the world, these middens or shellmounds, or shell heaps are built up over centuries.  

While driving over to Berkeley the other day, I crossed a road called Shellmound Street, which apparently was originally the road leading to the shellmound shown above.

There are lots of stories about the shellmound on Shellmound Street.  It apparently once had a dance hall on top of it, and an amusement park off to the side. It was there until 

Over the years I've seen shellmounds and "regular" Native American mounds at various places around North America.  While the Emeryville shellmound is probably the biggest one I've lived near, the size of it made me wonder if there weren't a few others in the San Francisco Bay area. 

Today's SearchResearch Challenge is fairly simple, but getting a good quality answer might be tricky.  

1. I want to know if I NOW live near any Native American shellmounds. (By "near," I mean within 5 miles / 8km.)  Can you find a map that shows an extensive set of shellmounds in the SF Bay Area?  Are any of those near Mountain View, CA?   (Extra credit: Can you find any images of the nearest shellmounds?)   

2. A big part of my family hails from the area around Rice Lake, WI.  Are there any Native American mound structures there?  If so, where?  

Let us know HOW you found the answer to these Challenges!  They're not hard, but as I suggested, sometimes it's difficult to find a really high resolution map that we can use to answer the questions. 

Keep Searching!