New Meetup: Geology of Angel Island

From: Lee T.
Sent on: Thursday, September 23, 2010 11:16 PM
Announcing a new Meetup for SF Bay Area Geology & Natural Science Hiking Group!

What: Geology of Angel Island

When: Sunday, October 10,[masked]:30 AM

Price: $1.00 per person

Where: Angel Island
Angel Island State Park
San Francisco, CA 94101

Angel Island is Trip 3 in Geologic Trips -- SF and the Bay Area (chapter title: Metamorphism and Blue Schists). I'm working on collecting a few web sites with more information, so folks can do a little reading before we embark on our trip.

From the book:
Most Franciscan rocks have not been metamorphosed; that is, the pressures and temperatures in the subduction zone were not high enough to alter the rocks significantly. However, the Franciscan rocks that make up Angel Island are metamorphosed. They have been altered by extreme high pressure in the subduction zone. These rocks mus have been carried to greater depths in the subduction zone than most Franciscan rocks.

We did this hike in August 2009; you can see photos and reviews of it here.

  • We'll circle the island, which is 5 miles, plus any sidetracks.
  • Layer your clothing: it can be breezy out there in the middle of the bay.
  • Bring food and drink. There are food concessions at the start, but not when we'll be at lunch time.
  • Dogs are not allowed except for service animals.

You'll need to take a ferry to Angel Island (you can park your own boat, but I don't know the docking fees), so check the times below because we're leaving from the Ayala Cove area of the island at about 10:30 (boats arrive 10:10 & 10:20). Be sure to get to your ferry terminal a bit early, we had a few people miss the boat last year.

More information about Angel Island
I'm starting a page with links to Angel Island geology pages (including books you can buy ahead of time):
Angel Island

Prices are round trip and include park admission (I checked the times for this year, but not the prices, so they may or may not have gone up).

From Oakland or Alameda, take a ferry to Pier 41 and (free) transfer to Angel Island Ferry
Ferry from East Bay
Oakland Alameda Pier 41
9:00 am 9:10 am 9:35 am
Pier 41 Angel Island
9:40 am 10:05 am
Price: $15.50 adult; $[masked], 62+; $8.50 disabled, 12 and under free.

For many East Bay folks, it may be just as quick/simple to take BART to Embarcadero and load the 9:20 Blue and Gold Ferry at the Ferry Building.

Looks like only one return trip, which is direct to Oakland/Alameda:
Departs Alameda Oakland
3:10 pm 3:45 pm 3:55 pm

Blue and Gold fleet
Ferry Building Pier 41 Angel Island
9:20 am 9:40 am 10:05 am (East Bay folks will also transfer on this boat)

Return trips
2:55 pm to Pier 41 at 3:25
4:30 to Pier 41 at 5:25 and Ferry Bldg at 5:50

Ticket prices online have $1.50 service charge each way. The online price seems to be $18 for adults and $11.50 for kids 6-12.

Angel Island-Tiburon Ferry
Leaves Tiburon at 10:00, arrives Angel Island at 10:20.
Adults (ages 13 and over) $13.50
Seniors $13.50
Children (ages 6 - 12) $11.50
Small Children (ages 3 - 5) $3.50
Toddlers (ages 2 and under) Free*

Return trips at 20 minutes after the hour; last boat at 5:20.

Blue and Gold, transfer in SF
Depart Vallejo at 8:30 am, join the SF group on the ferry from Pier 41
Not sure of price

One return trip: 4:15 - 6:30.

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