DRAFT   Representative Geologic Materials in the Everett-Seattle-Tacoma Area

Representative Geologic

Typ Map Symbols

Typ USC/grain size

Typ Structure

Vs

Loose

Medium

Dense

Boring

Geology

Strong Ground Motion Station

Deposit**

(if est.)

Soft

Stiff

Hard

Log?

source

Sites*

Fill

mf, m, f, af, gr

variable

variable

x

x

x

BOE, HAK, HAR, HAW, NOWS, TBPA, UNK

Fill/peat

Fill/loose sand

Fill/medium dense strat

Fill/dense strata

Fill/?

Peat

pt, m,

PT, OL

bedded

x

Beach Deposits

Qb, Hb

silt, sand, gravel

crudely bedded

x

x

Tideflats

Qtf, tf

ML, OL, SM

laminated

x

x

Mass Wastage Deposits

Qmw, mw, ls, Qls

variable, silty

jumbled

x

x

ELW

Lake Deposits

ML, OL, SM, SP

laminated

x

Deltas

silt, sand, gravel

cross/horiz bedded

x

x

Alluvium

Qal

silt, sand, gravel

bedded

x

x

BRKS, KINR, TKCO, WYN?

Mudflow

om, Qom

silt, sand, gravel

jumbled

x

x

Glaciomarine Drift

gmd

silty, clayey diamict, frac

none to crudely bedded

x

x

x

Recessional Outwash

Qvr

sand, gravel

bedded

x

x

ALCT, CSEN, EARN, KIMR, MURR, PCEP, RAW, STAN

Recessional Lake Deposits

Qvrl

clayey, silty

laminated to bedded

x

x

Recessional Lake Deposits

Qvrl

sandy, silty

laminated to bedded

x

x

Ice-Contact Deposits

Qvi

variable

variable

x

x

x

TTW

Vashon till

Qvt

sandy, silty diamict, frac

none to crudely bedded

x

FINN, KIMB, KITP, LAP, LEOT, MPL, PNLK, RBEN, RHAZ, SEA?, SP2, SPW, TES?, UPS, WISC

Esperance Sand

Qe, Qva

sand, gravel

massive to bedded

x

EAK, HAN, HOLY, LAWT, MARY, QAW, WEK, WIN

Lawton Clay

Qvlc, Qc

clay, silt, frac

laminated to bedded

x

Pre-Vashon Deposits

pQv

variable

variable

x

Sed/Vol Bedrock

Bx, Tu

variable, frac

variable

x

x

ERW?, SEW

Intrusive Bedrock

Bx, Ti, Tu

variable, frac

variable

x

GNW

* not all stations are listed

**  the surficial geologic unit, see boring log for stratification and thickness