Bedrock geologic and Quaternary tectonic map of the Port Townsend area, Washington

Gower, H.D.

doi:10.3133/ofr801174

Cited by 3 publications

(5 citation statements)

References 4 publications

(5 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The foraminifera at Maynard (FL-1, FL-2; table 2) range from no older than upper Ulatisian to Narizian in keeping with the accepted age of the Aldwell Formation. But, north of the quadrangle, in the Port Townsend area, lithologically identical rocks ranged in age from Ulatisian to possibly Penutian (Gower, 1980). We believe that these rocks are equivalent to the upper Eocene rocks described by Durham (1944), the Scow Bay Formation of Allison (1959) and Thorns (1959), and the unnamed Eocene unit of Armentrout and Berta (1977) from the Quimper Peninsula north of the quadrangle.…”

Section: Aldwell Formation and Related Rocksmentioning

confidence: 63%

“…It is likely that many of the clasts in the upper conglomerate have been derived from underlying or nearby Lyre conglomerate outcrops. But the marked angular discordance between the two units south of Moon Lake makes it possible to map the two units separately, at least locally (Gower, 1980). In addition to overlying the Lyre Formation, the unnamed conglomerate also rests on Crescent basalt flows (Tev) and basaltic conglomerate (Tevc) northeast of City Lake.…”

Section: Unnamed Conglomerate East Of Port Discoverymentioning

confidence: 99%

See 1 more Smart Citation

Bedrock geologic map of the Seattle 30' by 60' quadrangle, Washington

Yount¹,

Gower²

1991

Open-File Report

Self Cite

View full text Add to dashboard Cite

Section: Aldwell Formation and Related Rocksmentioning

confidence: 63%

Section: Unnamed Conglomerate East Of Port Discoverymentioning

confidence: 99%

Bedrock geologic map of the Seattle 30' by 60' quadrangle, Washington

Yount¹,

Gower²

1991

Open-File Report

Self Cite

View full text Add to dashboard Cite

“…Possible Holocene upper-plate faults near enough to the head of Discovery Bay to have significant potential for producing decimetre-scale land-level changes in the marsh are inferred from regional-scale mapping (Gower, 1980) and subsurface geophysical data (Johnson et al, 1996;Brocher et al, 2001). The Sequim fault is a south-dipping thrust that trends east-west through the bay about 9 km north of the marsh (Figure iB).…”

Section: Cascadia Subduction Zonementioning

confidence: 99%

“…The Sequim fault is a south-dipping thrust that trends east-west through the bay about 9 km north of the marsh (Figure iB). Based on the mapping of Gower (1980), Johnson et al (1996 Figure 2) show three near-vertical, northand northeast-trending faults in the Eocene Crescent Formation 2 to 5 km south and west of the bay. The down-to-the-east sense of displacement shown for the Hood Canal fault, which trends into the bay from the south about 3 km northeast of the marsh, would, however, suggest relative uplift of the marsh during movement of the fault.…”

Section: Cascadia Subduction Zonementioning

confidence: 99%

Multiple sources for late-Holocene tsunamis at Discovery Bay, Washington State, USA

2005

View full text Add to dashboard Cite

Nine muddy sand beds interrupt a 2500-yr-old sequence of peat deposits beneath a tidal marsh at the head of Discovery Bay on the south shore of the Strait of Juan de Fuca, Washington. An inferred tsunami origin for the sand beds is assessed by means of six criteria. Although all the sand beds contain marine diatoms and almost all the beds display internal stratification, the areal extent of the oldest beds is too limited to confirm their origin as tsunami deposits. The ages of four beds overlap with known late- Holocene tsunamis generated by plate-boundary earthquakes at the Cascadia subduction zone. Diatom assemblages in peat deposits bracketing these four beds do not indicate concurrent change in elevation at Discovery Bay. Diatoms in the peat bracketing a tsunami bed deposited about 1000 cal. yr BP indicate a few decimeters of submergence, suggesting deformation on a nearby upper-plate fault. Other beds may mark tsunamis caused by more distant upper-plate earthquakes or local submarine landslides triggered by earthquake shaking. Tsunamis from both subduction zone and upper-plate sources pose a significant hazard to shoreline areas in this region.

show abstract

“…The major structures (fig. 5) are, from north to south, the Vedder Mountain Fault, the Boulder Creek Fault, the Haro Fault, the Mount Vernon Fault, the Devils Mountain Fault, the Northern Whidbey Island Fault, the Southern Whidbey Island Fault, the Mountlake Terrace Anticline, the Seattle Fault, the Seattle Fault Zone, the Hood Canal Fault, the Narrows Structure (fault or monoclinal fold), and the Olympic gravity anomaly (Gower, 1980;Gower and others, 1985;Cheney, 1987;and Gordy, 1988). Previously, letter symbols have been used to identify some of these structures; herein they are given geographic names to provide an improved sense of their location.…”

Section: Geologic Structurementioning

confidence: 99%

Geologic framework for the Puget Sound aquifer system, Washington and British Columbia

Jones¹

1999

Professional Paper

View full text Add to dashboard Cite

The RASA Program represents a systematic effort to study a number of the Nation's most important aquifer systems, which, in aggregate, underlie much of the country and which represent an important component of the Nation's total water supply. In general, the boundaries of these studies are identified by the hydrologic extent of each system and, accordingly, transcend the political subdivisions to which investigations have often arbitrarily been limited in the past. The broad objective for each study is to assemble geologic, hydrologic, and geochemical information, to analyze and develop an understanding of the system, and to develop predictive capabilities that will contribute to the effective management of the system. The use of computer simulation is an important element of the RASA studies to develop an understanding of the natural, undisturbed hydrologic system and the changes brought about in it by human activities and to provide a means of predicting the regional effects of future pumping or other stresses. The final interpretive results of the RASA Program are presented in a series of U.S. Geological Survey Professional Papers that describe the geology, hydrology, and geochemistry of each regional aquifer system. Each study within the RASA Program is assigned a single Professional Paper number beginning with Professional Paper 1400.

show abstract

Bedrock geologic and Quaternary tectonic map of the Port Townsend area, Washington

Cited by 3 publications

References 4 publications

Bedrock geologic map of the Seattle 30' by 60' quadrangle, Washington

Bedrock geologic map of the Seattle 30' by 60' quadrangle, Washington

Multiple sources for late-Holocene tsunamis at Discovery Bay, Washington State, USA

Geologic framework for the Puget Sound aquifer system, Washington and British Columbia

Contact Info

Product

Resources

About