Ocean 10 West Valley College

R. Lopez

NAME_________________

Field Trip Exercise: Natural Bridges State Park

 

BEACHES AND THE LONGSHORE CURRENT

 

Beach =

 

Longshore current =

 

Wave Refraction =

 

Rip Currents =

 

 

HEADLANDS, SEA CLIFFS, SEA STACKS, AND WAVE-CUT PLATEFORMS

 

Headlands =

 

 

Sea Cliffs =

 

 

Sea Stacks =

 

 

Sea Arches =

 

 

Marine Terraces =

 

 

Wave-Cut Platform =

 

 

 


 

Marine Terraces

 

Marine Terraces =

 

Wave Cut Platform =

 

The Santa Cruz Mountains have experienced considerable tectonic uplift. This uplift has elevated marine terraces along their flank. So the older marine terraces were formed underwater in the surf zone before uplift of the Mountain. To give you and example of the rate of uplift, during the 1989 Loma Prieta Earthquake, the Santa Cruz Mountains were elevated by four feet in some areas. Over time, enough of these earthquakes can really change the elevation of the coastal areas.

 

There are five relatively well preserved marine terraces along the coast between Santa Cruz and Ano Nuevo State Beach. We will see the three youngest on our field trip.

 

Youngest (lowest): Santa Cruz terrace (*)

Western terrace (*)

Wilder terrace (*)

Black Rock terrace

Oldest (highest): Quarry terrace

 

The marked ones are visible from Natural Bridges State Park.

 

Santa Cruz Terrace underlies West Cliff Drive, Mission Street, and Highway 1. The shore-angle elevation is about 100 ft (elevation of the terrace at the old sea cliff). Age about 100 Kyr (Pleistocene) recent work suggests that this terrace is 60 Kyr.

 

Western Terrace the hill on Western Drive is the old sea cliff between the Santa Cruz terrace and Western Terrace. (shore angle is about 280 ft.). Age = about 200 Kyr.

 

Wilder Terrace after Wilder creek. The ancient sea cliff for the Wilder Terrace is the small hill between the main entrance of the UCSC campus and the lower entrance to the bike path.

 

Black Rock is about 570 ft high, age about 430,000 years

 

Quarry Terrace is about 720 feet high, age 550,000? Years

 

Rocky Intertidal Community

 

We will investigate the high, middle, and low tide zones. For this project, you will identify a variety of organisms and classify them based on Phylum, Class (if possible), and location in intertidal zone plus type of habitat within the zone. Record your data on the table below. We are identifying algae, marine plants, and all organisms.

Vertical Distribution of Intertidal Life

 

Intertidal Zone Habitat in Zone

Species

(Common name)

Phylum

Class

Upper

Middle

Low

Flat

Area

Tide

Pool

Wall

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


Vertical Distribution of Intertidal Life

 

Intertidal Zone Habitat in Zone

Species

(Common name)

Phylum

Class

Upper

Middle

Low

Flat

Area

Tide

Pool

Wall

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


Directions to Natural Bridges State Beach in Santa Cruz

 

      HWY 85 South from West Valley College

      HWY 17 South to Santa Cruz

      HWY 1 North (in Santa Cruz)

      Follow signs to Half Moon Bay San Francisco on HWY 1

      HWY becomes Mission Street in Santa Cruz

      Continue on Mission Street to intersection at Swift Street (stop light)

      Turn Left onto Swift Street (going toward ocean)

      Turn Right at the stop sign onto Delaware Ave.

      Drive down on Delaware to BACK GATE of Natural Bridges State Beach

      Park along Delaware Ave. at the back entrance to the park

      Meet group at the back gate entrance.

 

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