DescriptionOfMapUnits_ID,Description
DMU01|
DMU02|Sand and gravel as fill, or extensively graded natural deposits. Mapped only where modification is sufficiently extensive that the underlying deposit cannot be inferred. Locally mapped as
DMU03|Sand, gravel, and wood waste placed as fill. Mapped especially in road prisms where compaction by seismic shaking is a predictable hazard
DMU04|Silt, sand, muck, and peat deposited in wetlands. Mapped on basis of surface morphology or presence of surface water and wetland vegetation
DMU05|Well-sorted, unconsolidated sand, gravel, and silt deposited by post-glacial streams. Locally may contain intercalated poorly-sorted debris-flow deposits
DMU06|Sand, gravel, and logs deposited by wave action. Underlies nearshore flats. Beach deposits not mapped seaward of the high water line. Locally includes mud and peat deposited in wetlands developed inboard of the beach berm
DMU07|Diamict, sand, gravel, silt, and soil transported in deep-seated landslides. Deposits commonly less dense than parent materials. Commonly water-saturated. Largely mapped on basis of morphology. Some landslide deposits may be latest Pleistocene in age
DMU08|
DMU09|Moderately sorted gravel and sand, 1<chr(8211)>3 m thick, that mantles till and older deposits at low elevations. Beach and stream deposits formed when late-glacial sea level was higher than at present, or along shores of late-glacial ice-marginal lakes. Mapped from exposures in shoreline bluffs, local artificial exposures, and surface morphology
DMU10|
DMU11|Divided into:
DMU12|Gravel, sand, and diamict deposited against stationary ice. Commonly reworked by slumping. Mapped on basis of surface morphology
DMU13|Mostly dense sandy diamict. Pebbles are matrix supported; most are well-rounded. Rare clasts larger than 10 cm are commonly sub-angular to angular. Lenses of bedded sand, silt, and gravel are common. Wave-etched exposures commonly show sub-horizontal foliation in diamict and isoclinal folding of silt and sand lenses. In many upland locales, till is mapped on basis of clayey, pebbly subsoil, commonly with gray to green-gray hue indicative of minimal oxidation. Good shoreline bluff exposures indicate that most Vashon till is subglacial lodgement till. Locally mapped as:
DMU14|Coarse, cross-bedded gravel that grades into overlying Vashon till 
DMU15|Quartzofeldspathic medium-fine to medium sand, locally pebbly or with small amounts of gravel or silt. Little cemented, though locally supports vertical faces. In deep exposures, commonly little oxidized. Sub-soils derived from this unit are mostly loose sand, light-colored when dry. Advance outwash deposits. Local cross-beds and large foresets suggest deposition in fluvial or deltaic setting; elsewhere, pervasive decimeter-thick planar beds and low-angle cross-beds suggest deposition by prodelta turbidity currents
DMU16|Thin-bedded (5 mm to 15 cm) dark gray silt and clay, locally with dropstones and (or) lenses of ice-rafted sand and gravel. Lacustrine advance outwash deposits
DMU17|Sand, gravel, silt, peat, sandstone, mudstone, conglomerate, and diamict of fluvial, lacustrine, and glacial origin. May include marine deposits. Where outcrop is good, it is evident that much of material mapped as <ga>Qpv</ga> is interbedded sand and gravel of fluvial origin or thin-bedded fine sand and silt of indeterminate origin. 

<p>Mostly mapped where poor outcrop<chr(8212)>typically, brown, sandy, pebbly subsoil<chr(8212)>does not permit a more detailed classification. Probably includes deposits elsewhere mapped as <ga>Qpvf</ga>, <ga>Qup</ga>, and <ga>Qpog</ga>. May include minor <ga>Qve</ga> and <ga>Qvlc</ga>. Locally mapped as
DMU18|
DMU19|
DMU20|Till, pebbly mud, and tillite and associated silt, sand, gravel, and conglomerate. Subsurface deposits recognized as glacial on the basis of identifiable till fragments and (or) predominance of clasts suggestive of northern provenance: granitic and (or) metamorphic clasts in gravel; garnet, epidote, magnetite, and (or) metamorphic rock fragments in sand. In subsurface, locally divided into:
DMU21|Silt, clay, sandy silt, gravelly silt, gravelly sandy silt, clayey silt, and silty clay. Present in subsurface only
DMU22|Diamict, gravel, sand, sandy gravel, silty gravel, clayey gravel, gravelly sand, gravelly silty sand, silty sand, gravelly clayey sand, and clayey sand. Present in subsurface only
DMU23|Fine-grained (silt, clay) deposits with minor sand and gravel and associated marine shells. Present in subsurface only
DMU24|Present in subsurface only. Sand, gravel, silt, clay, and peat. Identified as non-glacial by the presence of in-situ peat, paleosols, plant fragments, plant-fragment impressions, and (or) in-situ volcanic deposits (ash, pumice, mud-flow). Locally, predominance of volcanic clasts suggests central Cascade Range provenance. Present in subsurface only.  Locally divided into:
DMU25|Silt, clay, sandy silt, clayey silt, silty clay, and peat. Present in subsurface only 
DMU26|Sand, gravel, sandy gravel, gravelly sand, gravelly silty sand, silty sand, clayey sand, and peatnd gravel, minor silt and clay, of indeterminate origin. Present in subsurface only
DMU27|Silt, clay, sandy silt, clayey silt, silty clay, and peat. Present in subsurface only 
DMU28|Sand and gravel, minor silt and clay, of indeterminate origin. Present in subsurface only
DMU29|Variably lithified fluvial gravel and sand, locally cross-bedded, with interbedded silt and peat. Gravel commonly oxidized. Gravel has high concentration of dark basaltic sandstone and basalt clasts that suggest an ultimate source in the Olympic Mountains. Gravel beaches below bluffs of University Point beds are noticeably darker than typical central Puget Sound beaches. Presence of a small fraction of granitoid pebbles in conglomerate and absence of pervasive clayey alteration of sandstone distinguish University Point beds from the Blakely Harbor Formation (exposed 3 km south of map area), which they otherwise resemble. 

<p>At University Point and north of Fletcher Bay, shoreline bluff exposures display 2<chr(8211)>3 m thick fining-upward sequences indicative of meandering stream deposits; silt and peat are overbank facies
DMU30|Massive to disrupted silt, clay, and sand. Some silt is waxy-textured. Most disruption appears to be non-tectonic. Present in subsurface only 
DMU31|
DMU32|non-tidal open water
DMU33|tidal open water
