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Quarry Walls and in Roadcuts to the West

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Quarry Walls and in Roadcuts to the West 310 LIMESTO NES OF WESTERN WASHINGTON Slickensides on the west and east contacts indicate movement between the enclosing wall rock and the limestone . Several other fau lts and shear zones are exposed in the quarry walls and in roadcuts to the west. The limestone is contained in a sequence composed predominantly of black carbonaceous shale, but including a considerable amount of ribbon chert and minor amounts of greenstone and graywacke. These rocks are be lieved to be of Permian age and have been tentatively assigned to the Trafton sequence. The limestone is cut by numerous calcite veinlets, which stand out in relief on weathered surfaces. No fossi Is were seen. Popoff (1949a, p. 6) suggested that a continuation of the limestone might lie under an increasing thickness of over­ burden in a low ridge about 40 feet wide extending 1,000 feet to the north from the quarry, as the limestone bodies in this area are more resistant than the enclosing bedrock and commonly stand up as knolls and ridges. However, shale overlies the limestone on the quarry face, and the Ii mestone appears to plunge down to the north under bedrock overburden. About 1,000 feet to the northeast is a second area of limestone outcrop. It consists of two exposures- one, near a slough of the North Fork of the Stillaguamish River, which looks very much like a buried boulder and might be limestone float; and a second, which lies about 350 feet to the northwest and 150 feet above the river. At this latter locality, poorly exposed knobs of limestone project up through soi l and drift over an area of about 500 square feet. The limestone is simi lar in appearance to that exposed in the quarry. It has not been developed. Calcareous shales crop out in streambeds to the northwest of the limestone and are cut by calcite vein lets. They have been called limestone, but are too impure to be of economic value. Quality. - The limestone is a high-calcium type. Chemical onolyses of Jack limestone Sample Loss on Location length CaC0 ignition CaO Si0 Fe o Al 0 p s Sample 3 WYJO 2 2 3 2 3 no . (feet) !/ Sl West side of quarry ----- 18.0 43.6 55. 1 0.4 0.2 o. 1 0.2 0.016 0. 004 !/ S2 East side of quarry ----- 7.5 43.0 54.0 0.4 2.0 O. l 0.3 0.023 0.002 !/ S3 East side of quarry ----- 26.6 43.6 55. 1 0.4 0.4 0.1 0.1 0. 027 0.002 !/ S4 Center of quarry ------- 26.5 43.6 55. 4 0.4 0. 2 o. 1 o. 1 0.052 0.000 !/ S5 Outcrop ? near slough --- 43 . 8 55. 6 0. 4 0.2 0.2 o. 1 0.015 0.004 !/ S6 Undeveloped outcrop to north -------- 43 . 5 55.5 0.3 0.5 0.2 0. 4 0.038 0. 001 V Sec. 16, north of Jack deposit. Calcareous shale Composite 24.6 11.74 15. 16 1.30 63. 94 2. 14 5. 94 !/ Popoff (1949a, p. 7). V Unpublished private analysis. Ownership and development. -The present owner of this property is unknown . The deposit was owned in 1945 by J. A. Jack, and was operated by him from October 1941 until some time before 1949. Production was irregular, 22 tons a day being produced in March of 1943 and about 4,000 tons being produced per year. Most of the limestone was shipped to Northwestern Glass Company, of Seattle, but in 1943 about 50 tons per week was also being sent to Longview, Wash., for pu lp mills, and previously some had been shipped to a pulp mill at Anacortes. Agricultural stone was supplied to local far­ mers, and a mi 11 for crushing and grinding was located at the quarry. Rock was hauled by truck and stored in bunkers at the SNOHOMISH COUNTY 311 community of Bryant, to the west. A 7!-mile truck haul was required. An unpublished geological report on the property that was circulated in the local area states that the deposit was of a size suitable for a cement plant, but this was certainly not the case, as the deposit is now exhausted. It was not a porticularly profitable operation. The second outcrop area to the north has not been investigated sufficiently to determine its size, but it is probably too small to be of economic value. References. -Guard (1943, unpublished field notes), Mathews (1947, p. 44-45), Popoff (1949a, p. 6-7), Danner (1957, p. 204). Skagit Power Line Deposit Location, size, and accessibility. -The Skagit Power Line deposit is along the City of Seattle Skagit Power Line right-of-way in the north center of sec. 10, T. 31 N . , R. 6 E., approximately 10 miles from the town of Arlington by rood, the last 2 miles of which is on the Skagit Power Line right-of-way. The outcrop is at an altitude of about 625 feet, on a relatively flat hilltop between Bear Creek and Porter Creek in brushy logged land. The limestone forms a bed that is exposed for about 100 feet in o north-south direction and is at least 50 feet wide. Geology and description. -The deposit is a poorly exposed limestone body consisting of discontinuous weathered knobs 1 to 2 feet high and small solution depressions. The greatest vertical exposure is 6 feet. Limestone is in contact with shale, sandstone, and conglomerate on the west, but on the east an area covered with glacial drift over 100 feet wide sepo­ rates the eastern limit of limestone exposure from that of other types of bedrock. A brief exploration to the north and south did not reveal any additional limestone outcrops. The limestone is gray in color and dense or oolitic-organoclastic in texture. It is of Permian age and contains abundant fusu linid fossils. Quality. -The quality is unknown, but the limestone is probably of a high-calcium type similar to that of all the other Permian limestones in the area. Ownership and development. -The property is owned by Seattle City Light. There has been no development, and the deposit appears too small to be of economic value. However, its true size is unknown. It probably could not be devel.­ oped because of the danger of damage to power lines overhead. References.-Popoff (1949a, p. 7), Danner (1957, p. 218). Paddock (Morcrop} Deposit Location, size, and accessibility.-The Paddock, or Morcrop, limesto!'le deposit is in the SE! sec. 2, T. 31 N., R. 6 E., about 7 miles east of the town of Arlington and a few hundred feet south of the City of Seattle Skagit Power Line road, H miles west of Jim Creek. The deposit consists of at least 14 lenses of limestone, the largest of which was about 375 feet long and had a maxi­ mum width of 125 feet. It produced a little over 100,000 tons of high-calcium limestone . The other bodies are smaller, and most of them contain only a few thousand tons or less. The deposit is accessible by 5 miles of poved road connecting with the Arlington-Darrington highway near Trafton and by about 2 miles of gravel-surfaced road. The area is hilly and is covered with dense second-growth trees and brush. Geology and description. -The deposit consists of a sequence of limestone lenses interbedded with argillite, ribbon chert, graywacke, and volcanic rocks exposed along a northwest-southeast strike for a distance of 3,250 feet. When devel­ opment of the property began, only a few knobs of limestone were visible projecting through glacial drift and soil. It was thought then that the outcrops might be connected and compose a continuous bed. Subsequent stripping has shown the out­ crops to represent mostly separate individual bodies. In some cases they may have been continuous beds when deposited, but they are now seporated by faulting. The most northerly outcrop consists of dark bluish gray limestone exposed about 675 feet northwest of the main quarry, 120 feet west of the quarry road, and about 350 feet east of the Skagit Power Line. The outcrop extends over an area of about 312 LIMESTONES OF WESTERN WASHINGTON E. N. CONTOUR INTERVAL 80 FEET DATUM IS MEAN SEA LEVEL FIGURE 150.-lndex mop showing limestone deposits of the Twin lakes area. SNOHOMISH COUNTY 313 EXPLANATION TRAFTO~UENCE Ii Limestone o Atg1lll1t, che'1~1one, g«>y..,cke ; :. -Foult ---135 Strike and dip or beds Con1oc1 -/--......., lnfer,ed con1oc1 Quarry F Fossll locality S.I u.S.B,M. Sample - ~N - j L 3Q() 600 Feet Score Contou, ,ntervol 10 feet FI GURE 151.-Poddock (Morcrop) deposit. SE! sec. 2, T. 31 N., R. 6 E. Geology by W. R. Donner. Bose map modified from Figure 2, U.S. Bureau of Mines Report of Investigations No. 4393, by C . C . Popoff, 1949. 60 square feet and is surrounded by soil and glacial drift. It is reported that limestone was encountered in the roadbed of the quarry rood 120 feet east of this outcrop when the rood was under construction, but the grovel surfacing used on the rood covered the outcrop and it is not now visible. The second outcrop from the north- and also the largest-was quarried for several years, and most of the limestone has now been removed. It was about 375 feet long and had a width of from 20 feet at the south end to a maximum of about 125 feet in the middle.
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