At depth below the surface, it is likely pleistocene 2 million years ago to 11,000 years ago in age and has been mapped as. An active fault is defined as one that has had surface displacement within holocene time about the last 11,000 years. Gc4nwqg pch the ocean wins earthcache in california, united. We make digital versions of preliminary maps available. When we discuss the geology of an area with plutonic rocks, the preexisting rocks, into which the plutonic rocks have intruded, are referred to as country rocks. Fault trenching conducted in 1985 and 1986 on south. Point mugu state park is a state park located in the santa monica mountains national recreation area in southern california. Mugu rock loop with shuttle from mulholland highway to malibu cafe approximately 44 miles with 1,380 feet of climbing short option.
New structural and tectonometamorphic data are presented from a geological transect along the mugu karnali valley, in western nepal central himalaya, where an almost continuous cross section from the lesser himalaya sequence to the everest series through the mediumhighgrade greater himalayan sequence ghs is exposed. Generalized geologic sections aa and bb through th. Marine geology cmg piston cores collected on 1999 and 2003 cruises. Waves hitting the point of mugu rock have the most energy because. Mugu rock is a distinctive feature of the coastal headland promontory that has. The nearest weather station for both precipitation and temperature measurements is point mugu nf which is approximately 15 miles away and has an elevation of 10 feet 10 feet higher than arch rock. The verdugo fault is located approximately 11 miles northeast of the project site. Geology, soils, mineral resources, and paleontology the quaternary alluvium exposed at the surface in the site vicinity has been mapped as holocene 11,000 years ago to present in age helley and graymer, 1997. Detailed meso and microstructural analyses were carried out along the.
Mugu rock loop approximately 57 miles with 3,500 feet of climbing today is your opportunity to ride, relax and immerse yourself in the beauty of the santa monica mountains and the malibu coastline. Mugu area the lower to middle miocene topanga formation underlies the monterey formation. Active lower crustal deformation and himalayan seismic. Californias geogems exemplify the geologic legacy and processes that. Plutonic rocks are always intruded into preexisting sedimentary, igneous or metamorphic rocks. Department of homeland security instruction manual 0230100101.
Jul 28, 2014 the tip of point mugu earned the dark moniker dead mans rock, and in 1930 inspector kenneth c. Ocean wave refraction concentrates wave energy on the rocks that stick furthest out in the ocean. Metamorphic rock has been changed by heat and pressure deep inside the earth. Quite steep this hill is, but your effort will be rewarded with some beautiful views of the pacific ocean. A study in beach formation south broward reef dogs. Well logs and velocities in similar rocks elsewher. Wish theyd used a tunnel instead, as mugu rock has severely eroded since the time i grew up 1960s. The mustang and mugu granites are exposed along the western edge of the. A preliminary characterization and kinematic analysis of. Plate 1 pdf plate 2 pdf plate 3 pdf plate 4 pdf plate 5 pdf plate 6 pdf. Pdf geology and tectonometamorphic evolution of the. The marine geology of the eastern santa barbara channel, with. Title including security classification san nicolas island barge landing. Pdf is the best choice for printing and should be the choice for most users.
Different levels of exposure between the eastern and western footwalls re. The giant sand dune on pch across from thornhill broome beach. Geology and ground water appraisal of the naval air. Nbvc point mugu outdoor adventure center the rock 18th street bldg.
A potentially active fault is a fault that has demonstrated surface displacement of quaternary age deposits last 1. The photograph to the left, taken at caulfeild cove near to horseshoe bay. Sycamore canyon to sandstone peak california alltrails. Geology, for the alquistpriolo earthquake fault zoning program. Sedimentary rock is formed by layers of sand and clay distributed by water or wind over time. Map of the oxnard plain showing waterlevel contours for spring 1944.
Natural changes and human impacts on the sand budgets. Igneous rock is formed from melted rock material called magma. Geologic summary of rock units in santa monica mountains national recreation area. The nosco ride app is the first app for the mike nosco memorial ride event held each year on november 3rd in southern california.
Mugu rock is a distinctive feature of the coastal headland promontory that has been featured in many film shoots and television commercials. Introduction to geological mapping lecture 1 3 field geology when rocks and rock materials are investigated in their natural environment and in their natural relations to one another, the study is called field geology. The middle miocene conejo volcanics form an acoustical basement and the overlying late cenozoic sedimentary rocks attain a thickness greater than 2,500 m. Chapter 11 hazards and safety ventura county general plan. The protolith may be sedimentary rock, igneous rock or another older metamorphic rock.
Generalized geologic map showing major rock units and fault traces in the scr. Recalculation of rbsr data using the algorithm of mahon 1996 yields an age of 18. Santa monica bay before descending into the pacific ocean at point mugu. Westlake village inn to mulholland highway approximately 31 miles with 960 feet of climbing avid option. They are printed on a usgs topographic map base in a consistent full color scheme at uniform scales of 1. Department of geology, tribhuvan university, trichandra campus, ghantaghar, kathmandu, nepal.
Andrew meigs vicechair, kerry sieh, doug yule, and ron bruhn, president of the structural geology and tectonics division of gsa. During late pleistocene time, some 15,000 years ago, geologic evidence indicates that a major expansion. Their works were on a larger scale as against the present study whose focus is on a smaller scale. The geologic investigations of rocks around angwan madaki and its evirons, north central nigeria. I remember watching the whales from the rocks at the waters edge at mugu rock. Attachment 2 geology and hydrogeology east subbasin and piru subbasin 2.
Discovering the beauty of charmlee parks geological formations. We noticed that the southernmost portion of the sand dune seems to have more large rocks in the sand from erosion of the mountains above. This short stretch of beach is the southern neighbor of the point magu navy base so it is often possible to hear gunshots from the firing range and aircraft flying overhead. Tor rock formation a tor, which is also known by geomorphologists as either a castle koppie or kopje, is a large, freestanding rock outcrop that rises abruptly from the surrounding smooth and gentle slopes of a rounded hill summit or ridge crest. Murphy of the california highway patrol appealed to the state highway commission for help. The site is a popular but dangerous place for fishing, sightseeing, cliff diving, and rock climbing up the sheer sides of the rock. Eastwest extension and miocene environmental change in. Rock provides the firmament beneath our oceans and seas and it covers 28% of the earths surface that we all call home. Waves hitting the point of mugu rock have the most energy because these waves have not slowed down much by the ocean bottom. Groundwater is water that flows or seeps downward and saturates soil or rock, supplying. This includes sediments and rock outcroppings in the nearshore and open ocean.
He earned his bs in geology from csun, was an instructor here in 1972, and has close connections to two csun geology professors. Below are weather averages from 1971 to 2000 according to data gathered from the nearest official weather station. The rock cycle includes the formation of new sediment and rocks are often found in layers, with the oldest generally on the bottom. The hueneme, mugu, dume, and santa monica canyons con tribute varying amounts. The image on the left was taken during the award presentation and includes l to r. Geological survey one consequence of the rock cycle model is the recognition that truly ancient rocks are very rare. Saleeby is a professor of geology at california institute of technology in pasadena, california. The series depicts the geology of more than a quarter of california.
Point mugu beach, a onethirdmile long triangle of sand, is located between point mugu rock and the naval property. The geologic investigations of rocks around angwan madaki. David fruhling of gold hill, oregon on 20121226 said. Pdf new structural and tectonometamorphic data are presented from a geological transect along the mugu karnali valley, in western nepal central. Point mugu beach is located just off of the 1 highway in ventura, california. On thanksgiving day 2008, three young men from oxnard were swept to sea and killed by a rogue wave while surf watching from mugu rock. Geology and ground water appraisal of the naval air missile. The giant sand dune on pch across from thornhill broome. Separating the two uas aquifers is an unconformity and discontinuous clay layer. Point mugu is a cape or promontory within point mugu state park on the pacific coast in. The 1973 point mugu earthquake, described in the previous section, is. Eastwest extension and miocene environmental change in the. There is a fee to park here b the ray miller trail trailhead, in the group camping area off the pch. Oct 15, 2019 mugu rock on california state route 1 in point mugu state park.
Marine geophysical investigations provide new data concerning the stratigraphy, tectonic and sedimentary history, and the ground water geology of the southeastern santa barbara channel region. Coast guard air station point mugu at nbvc environmental. Unconsolidated sediments underlie the base to an estimated depth of 1,500 feet 460 m. A rock with different visible layers would be a rock.
Subsurface data center openfile report 901, geology department, the university of toledo. Geological background tectonic regions charmlee park lies near the edge of the pacific tectonic plate, right onthe coast of the pacific ocean and relatively close to the north american plate, on which the eastern half of california lies. There is a fee to park here c chumash trail trailhead and dirt parking next to the pch, directly across from the orange observation tower next to the shooting ranges. The offshore stratigraphy identified in seismic reflection profiles includes a succession of neogene to quaternary strata. In this vicinity it is about 1,300 m thick and consists of deepmarine shale and sandstone intruded by the diabase dikes and sills that fed the overlying conejo volcanics. In october 1937, an army of day laborers began carving a 200footdeep road cut through point mugu. The marine geology of the eastern santa barbara channel. This igneous dike marks the western end of the santa monica mountains, and the rancho guadalasca boundary. Parking is found along the side of the highway next to the beach.
The northern hill, at least the several times weve now been there since originally posting this, has somewhat less rocks, leaving the sand smoother and. Discovering the beauty of charmlee parks geological. When we travel any distance in any given direction, it is impossible not to see the tremendous variety in color, texture, and shape of the rocks. The oxnard aquifer generally occurs at a depth of 100 to 250 feet below ground surface bgs uwcd, 2012b. Mugu rock loop approximately 57 miles with 3,500 feet of climbing. Regional perspective of the classic collided orogen this book addresses the geology of the entire himalayan range in nepal, i. The protolith is subjected to heat greater than 150 degrees celsius andor extreme pressure causing profound physical andor chemical change. The app is intended to help those participating in, volunteering at, or just wanting to know more about the event keep up with the latest happenings. These strata make up the two offshore groundwater basins, the mound and oxnard plain groundwater basins, which are separated by the eastwest. Origin and episodic emplacement of the manaslu intrusive. Within the past 10 to 20 years, geographic information system gis technology has begun to change aspects of geologic mapping by providing software tools that permit the geometry and characteristics of rock bodies and other geologic features such as faults to be electronically stored, displayed, queried, and analyzed in conjunction with a. Mugu and sni alternative 1 or the preferred alternative, use of only the point mugu location alternative 2, and use of only the sni location alternative 3. The 30by60 minute quadrangles include all of the detail of the 7. The geologic resources of an area consist of all soil and bedrock materials.
Submarine canyon and fan systems of the california continental. Mugu, and oxnard aquifers are identified in the seismic reflection profiles. Weathering has also given rise to circular rock basins formed by the accumulation of water and repeated freezing and thawing. Physical processes of beach dynamics along california. Mugu, california, earthquake of february 21, 1973, was a moderately sized. Pdf geology and tectonometamorphic evolution of the himalayan. In the south west of england, the term is commonly also used for the hills themselves. After a relaxed breakfast and a stroll through the manicured grounds. Fault, the san rafael fault, and the eagle rock fault. Recent alluvium of the oxnard aquifer and older alluvium of the mugu aquifer comprise the uas figure 34.
If you plan to drive yourselves, we will be sending out a separate itinerary on registration. The oxnard plain is composed largely of floodplain and marine sedimentary deposits. Strata that contain the offshore continuation of the five major onland aquifers grimes canyon, fox canyon, hueneme, mugu, and oxnard aquifers are identified in the seismic reflection profiles. Once exposed the rocks are eroded and become incorporated into younger rocks. Point mugu state park beaches californias best beaches. Runoff channels and stream courses between mugu rock and the venturalos angeles county line are referred to as south coast streams.
The geologic investigations of rocks around angwan madaki and. Dating of 28 tors on dartmoor showed that most are surprisingly young, less than 100,000 years old, with none over 200,000 years old. The rugged, nearly impassible shoreline of the western santa monica mountains gives way to tidal lagoons and coa. The middle miocene conejo volcanics form an acoustical basement and the. Geomorphic assessment of the santa clara river watershed. Contiguous part of the santa monica mountains until a 20thcentury roadcut created a distinct landform. Csun department of geological sciences to host 2020. The mysteriously large sand dune is the result of aeolian transport, or the winds movement of particles, in this case, sand. Because the nearest station and this geographic feature may. Attachment 2 geology and hydrogeology east subbasin and.
This paper was coauthored with caltech geology professor dr. Use the definitions from above to complete these sentences. Geological background tectonic regions charmlee park lies near the edge of the pacific tectonic plate, right onthe coast of the pacific ocean and relatively close to the north american plate, on. The rock was formed when the roadway was cut through the nearvertical ridge of resistant volcanic rock in 1937. Gc4nwqg pch the ocean wins earthcache in california. Technical or openfile reports not refereed unless otherwise noted 1990 stierman, donald j. The older rocks lying immediately below the saugus formation are 1 the pico formation, composed of gray marine sandstone, siltstone, and shale. Causes of rock deformation stress pressure placed on rocks strain deformation of the rock strength rock resistance to deformation brittle deformation the rocks break or fracture. Directly east of mugu rock is point mugu state beach campsite. The formation of complex society in southeastern mesoamerica. Then, point mugu was a nearvertical ridge of resistant volcanic rock an igneous dike that in a distant epoch intruded the topanga formations. Report on beach study in the vicinity of mugu lagoon, california.
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