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

2. REFERENCES

3. LIKE THE STORY POLE, THE LAND TELLS A STORY

4. 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)

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

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

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

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

9. ROSARIO HEAD –LOPEZ STRUCTURAL COMPLEX

10. *PILLOW BASALT-mid ocean ridge or hot spot

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

12. FAULTS
NEAR
ROSARIO BEACH
GATE
EAST OF LIGHTHOUSE POINT

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

14. BALDS, GROOVES, STRIATIONS AND POLISH
Goose Rock Summit Trails

16. 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

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

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

19. COASTAL SEDIMENT PROCESSES

21. SHINGLE BEACH
Rosario Beach

22. TOMBOLO
Rosario Head Trail
Lighthouse Point Loop
Kiket Island

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

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