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Level 3 Potential Conservation Area (PCA) Report <br />Name Rare Plants of the Chalk Barrens Site Code S.USCOHP8" 3283 <br />IDENTIFIERS <br />Site ID 482 Site Class PCA <br />Site Alias Beaver Creek <br />Site Alias Brush Hollow <br />Site Alias Portland <br />Site Alias Pueblo State Wildlife Area <br />Site Alias Pumpkin Hollow <br />Network of Conservation Areas (NCA) <br />NCA Site ID NCA Site Code NCA Sibs Name <br />2466 S.USCOHPs27035 Arkansas Valley Barrens <br />Site Relations Contained in Arkansas Valley Barrens (S.USCOHP *27035). Shares a small portion of its <br />boundary with Eight Mile Marsh (S.USCOHP*7858). Overlaps and shares a small portion of <br />its boundary with Boggs Creek (S.USCOHP*157) and Turkey Creek (S.USCOHP *23944). <br />LOCATORS <br />Nation United States Latitude 382334N <br />State Colorado <br />Quad Code <br />Quad Name <br />38104 -C7 <br />Swallows <br />38104 -C6 <br />Northwest Pueblo <br />3810408 <br />Hobson <br />38104 -138 <br />Pierce Gulch <br />38104D7 <br />Stone City <br />38104 -D6 <br />Steele Hollow <br />38105 -D1 <br />Florence <br />38105 -C1 <br />Florence SE <br />38104 -E6 <br />Buttes <br />38104 -B6 <br />Southwest Pueblo <br />38104 -67 <br />Beulah NE <br />38104 -E7 <br />Timber Mountain <br />County <br />Pueblo (CO) <br />El Paso (CO) <br />Fremont (CO) <br />Watershed Code <br />11020002 <br />11020003 <br />Minimum Elevation <br />Maximum Elevation <br />Watershed Name <br />Upper Arkansas <br />Fountain <br />4,800.00 Feet <br />5,600.00 Feet <br />Longitude 1050119W <br />SITE DESCRIPTION <br />1,463.00 Meters <br />1,706.88 Meters <br />Site Description <br />The site is characterized by barrens and breaks of Late Cretaceous shales, limestones, and chalks that <br />formed in the ancient alluvial terraces of the Arkansas River and its tributaries. The modem river course has <br />cut a deep canyon through the sedimentary bedrock that drops off in steep slopes adjacent to the river. Late <br />Cretaceous sedimentary layers are a composite of Carlile shale, Greenhorn limestone, and Graneros shale <br />as well as extensive swaths of Niobrara Formation. The barrens habitat that hosts the rare plants typically <br />has low vegetative cover (10 -20 %). The surface of the shale barrens generally consists of small, platy rock <br />fragments over a shallow, fine - textured soil matrix. Soils are calcareous and moderately to strongly alkaline. <br />The shale breaks support a mosaic of plant communities with the unifying feature of a sparse herbaceous <br />layer characterized by low cushion plants like woollycup buckwheat (Eriogonum lachnogynum), nailworts <br />(Patyonychia jamesii, P. sessr7ifolia), stemless four -nerve daisy (Tetraneuris acaulis), bladderpods <br />(Lesquerelia spp.), and Arkansas River fever few (Parthenium tetraneuds)_ The breaks vegetation mosaic <br />Copyright ® 2014. Colorado State University. Colorado Natural Heritage Program. All Rights Reserved. <br />Print Date ]-",,2.! 20 1 -1 <br />