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Geology of Southern Monterey Bay Douglas_Smith@csumb. edu Presented at Elkhorn Slough 11/18/04 Head of Geology of Southern Monterey Bay [email protected] edu Presented at Elkhorn Slough 11/18/04 Head of Monterey Canyon @ 18 ka before present Some images to generate discussion about landform/landscape equilibrium

1000 Ma Rodinia breakup (Aussies split U. S. ) Images from Ron Blakey (NAU) 1000 Ma Rodinia breakup (Aussies split U. S. ) Images from Ron Blakey (NAU)

500 Ma Passive Margin (like eastern seaboard) (blue rocks) 500 Ma Passive Margin (like eastern seaboard) (blue rocks)

100 Ma Subduction (Creates 3 part CA) (granite, fore-arc, trench 100 Ma Subduction (Creates 3 part CA) (granite, fore-arc, trench

Image Ron Blakey NAU 10 Ma- 5 Ma 10 Ma San-Andreas (duplicates CA on Image Ron Blakey NAU 10 Ma- 5 Ma 10 Ma San-Andreas (duplicates CA on coast) (Monterey Shale)

Basin & Range (Crustal Stretch Marks? ) Basin & Range (Crustal Stretch Marks? )

3 -d view 3 -d view

Future San Andreas Fault Slip Future San Andreas Fault Slip

2 Ma Landscapes Geomorphology Quaternary Geology 2 Ma Landscapes Geomorphology Quaternary Geology

 1. 75 km wide X 4 km long tributary Head 1. 75 km wide X 4 km long tributary Head

40 m deep as lin Sa uth mo 40 m deep as lin Sa uth mo

M. Canyon Carneros Creek SJB Pajaro M. Canyon Carneros Creek SJB Pajaro

M. Canyon Carneros Creek SJB up down Pajaro SAF M. Canyon Carneros Creek SJB up down Pajaro SAF

Stillwell Hall 2003 Link to Coastal Retreat Site Stillwell Hall 2003 Link to Coastal Retreat Site

Stillwell Hall October 2004 Stillwell Hall October 2004

Harbor House Condos October 2004 Harbor House Condos October 2004

Natural analog for seawalls? Natural analog for seawalls?

Systems Approach Sediment budget & Beach equilibrium Seacliff/Dune erosion Dune growth River sediment Adjacent Systems Approach Sediment budget & Beach equilibrium Seacliff/Dune erosion Dune growth River sediment Adjacent beach Beach Sand Storage Offshore bars Adjacent beach Submarine canyons

Geology of Southern Monterey Bay Douglas_Smith@csumb. edu Presented at Elkhorn Slough 11/18/04 Head of Geology of Southern Monterey Bay [email protected] edu Presented at Elkhorn Slough 11/18/04 Head of Monterey Canyon @ 18 ka before present Some images to generate discussion about landform/landscape equilibrium