BEDROCK STORIES GEOLOGY IN DECEPTION PASS SP Told by Michelle Marquardt Lidar view

REFERENCES

LIKE THE STORY POLE, THE LAND TELLS A STORY

TERRANE LAYERS + GLACIAL FROSTING =DECEPTION PASS STATE PARK San Juan Island Thrust System Transported, sub-ducted , ob-ducted , crashed, smashed, tilted, lifted, smeared, eroded, etc, etc, etc. Parts of the Fidalgo Ophiolite (Decatur terrane) Part of the Ocean Floor Assemblage (Lopez Structural Complex)

EXOTIC VOLCANIC ISLAND ARC PARTS AND THE PIECES OF THE FIDALGO OPHIOLITE (Decatur terrane)

FIDALGO OPHIOLITE * * EAST OF ROSARIO BEACH PARKING ANDESITE SOUTH BOWMAN BAY PLAGIO GRANITE *

FIDALGO OPHIOLITE * GREYWACKE * TUFFACEOUS ARGILLITE NORTH BRIDGE AREA GINNETT ROCK QUARRY * TUFFACEOUS ARGILLITE JOHN TURSI TRAIL

Rosario Head and Lighthouse Point – PART OF THE OCEAN FLOOR ASSEMBLAGE (LOPEZ STRUCTURAL COMPLEX)

ROSARIO HEAD –LOPEZ STRUCTURAL COMPLEX

*PILLOW BASALT-mid ocean ridge or hot spot

RIBBON CHERT *ARGILLITE * DEEP QUIET OCEAN LAYERED RADIOLARIA OOZE AND CLAY *ARGILLITE * TRENCH NEAR ERODING COAST MUD AND SILT SEDIMENTS

FAULTS NEAR ROSARIO BEACH GATE EAST OF LIGHTHOUSE POINT

Fraser glaciation, 18,500 to 10,000 years ago Over a mile thick

BALDS, GROOVES, STRIATIONS AND POLISH Goose Rock Summit Trails

ERRATIC – A BOULDER TRANSPORTED AND DEPOSITED BY A GLACIER THAT IS A DIFFERENT ROCK TYPE THAN THE SURFACE ON WHICH IT RESTS. ROSARIO HEAD AND ROSARIO TIDE POOLS

GLACIAL OUTWASH- sorted deposits washed out from a glacier by meltwater streams. Cornet Road trail towards Hoypus Point

GLACIAL TILL – UNSORTED DEPOSITS THAT DROP OUT OF A MELTING ICE SHEET ROSARIO BEACH

COASTAL SEDIMENT PROCESSES

SHINGLE BEACH Rosario Beach

TOMBOLO Rosario Head Trail Lighthouse Point Loop Kiket Island

SAND DUNES & LAGOON Sand Dune Interpretive Trail West Beach Cranberry Lake Trail

QUESTIONS? STILL SEARCHING FOR ANSWERS? BUY A PARK MAP AND SEE FOR YOURSELF!