vi ui i i a i a aa ae fi l a Witt | Hh hh i We | ne : i wl ii th “f | did spite” to. pi ive {i i a a ii ih ! Ht | i HA ci i) Mi ch hi Mi TMNT AOE ALE a iW i) Hii Ny hi Hi HN Wal! i) HI ut a : a Hi i = ee | ay! Haid | io i Alt it . § | i | i | ih a | ig it \ bs i ) i ay ii i = == — = + aka ery r neal Z iy 4. ” u riled fa | oe i Ske rata ff pa “os Pane Si. ip ta ‘ Secs EE cme he ant as B Spee at CR SN oer ata \ ore hele * ar pees ye ‘Aaah chalets PAG Rena teens ; na rf. ah anny te ae aS yh 'y ao Pat. ahs p Ler ot pl ft wt LMT ed ame | me VS Mets " in , TAY ie oi: pf mn . Lint) ae ays ed a) “ 3 * vr ee Ren meng vow ri cavite LE arabe: ¥ i =e Vy. 1 a adts 5 . 4 pa u Hee a ee + i a, oi an z is) as ‘ie a f i Fy PANG iW ie . “ RUD wie eat "4 fe ot petths i° BS Ba A esa eh Ss dane taba Sie lg Al tara WE SAM aeE te stone ogee Maen Blok tek Ase ERE Mee CORO Ee i PAN EMEA EA Lae Sc Real Lg ShiLes ana nie eat yw. AS ath A See Soa 2 3s = = = = “= c oO ] Interbedded clay and sand, the o) ‘ormer predominating » sand = | loeatly indurated, Sand, gravel, conglomerate, 9 Patapsco 2) o JURASSIC 2 Interbedded sand, gravel and clay - arcose, bed of clay near buve, ocewpying a quarter of the total thickness of formation: thin sand bed at base locally indurated. Siu RELVCIN LO: Re Patuxent TRIASSIC Clay, sand. Usually in rusty brown round= ed boulders or narrow dikes, 29) 3 Diabase SILURIAN-CAMBRIAN or PRE-CAMBRIAN In light colored dikes composed of quartz, feldspar and mica, Pegmatite Dark compact rocks ocourring in narrow bands. Basic Dikes HFISHING BATTERY Tnterbedded olay and sand, indurated. sand. Compact ai'eenish-qray rock | with inconspicuous quarl= and Seldspar phenocrysts. Horn- | blende and epidote abundant tn weathered specimens. Meta-Rhyolite Bir Nose Clay, sand, indurated sand. hd, f or reddish ae ta y qe ctaraotetiNe broken outcrops. Serpentine Peridotite Pyroxenite ae Dark, hard rock with white ‘eldspur and bronzy pyroxenes, Nigger head.’ Hypersthene Gabbro Norite S| Dark, hard, sometimes coarse i ‘ained rock weathering in Lh a ded boulders. “Ni per ae) cd: Gabbro Meta-gabbro Clay, sand, indurated sand, i. Quartz-hornblende gabbro gravel, arcose. ‘ . ht granitic rock with folic. o) a Re i ee ee Granite-gneiss f d Micaceous hornblendie and. ii i f| | Light granitic rock, often cf ‘ chloritic gneisses and schists banded, strongly micaceous and cecasionally conglomeritic. Mica-gneiss 4 ort \ \ fcenumnenaeest : ; ; , 5 “ | Galena Foi Colemaar \ 20 MARYLAND GEOLO W™ BULLOCK CLARK \, STATE GEOLOGIST CONVENTIONAL SIGNS “IN CO-OPERATION WITH MINES AND QUARRIES MINES AND QUARRIES VERTICAL SECTION ON LINE A-B IN OPERATION NOT WORKING U. S. G EO LO G | C L S U R VEY *® --_______Bullding Stone No a a Building Stone Sea. Level. CHARLES D.WALC Lhe eee Se Ee Clay and Kaolin ee ee Clay and Kaolin 0 , L , DIRECTOR nd bak dy Gan aT Flint and Spar e.daee er em Flint and Spar Stsqchanna River 1902 ; np Seale Woo 4 zy o a é i 3 4 Miles, — ; i i —— —. + ———— = hi SEES TT AA A A A PSS ELE IEE ——— ; Ze | oe th, 4 a a ae 5 Kilometers EUh iver Sassafras River } Contour interval 20 feet. Northeast Iver Datumis mean sea level, 15 a | L | { {0 Fs 76: 5! 7600" 55. 50 Geology of the Crystalline Rocks by F. Bascom Geology of the Coastal Plain Formations by G. B. Shattuck, A, Bibbins, B. L. Miller and F. B. Wright : Surveyed in 1899,1900 and 1901 UTH BY AHOENS CO BALTIMORE MD. gn ak x4 ety vee nero een “aaah Se AVR As . STATE OF MARYLAND MARYLAND AGRICULTURAL U.S. DEPT OF AGRICULTURE MARYLAND GEOLOGICAL SURVEY EXPERIMENT STATION U.S, BUREAU OF SOILS HIPATIERSON, DIRECTOR MILTON WHITNEY, CHIEF WM, BULLOGK CLARK, STATE GHOLOGIST ; ee : ca fi , ] oY tf Ber Teley ? 3 f = fo Layiduan j AC ‘ ZI he \ Seas at SHOWING THE TOPOGRAPHY AND —> © ++ “ELECTION DISTRICTS — MARYLAND GEOLOGICAL SURVEY WY BULLOCK CLARK, state ceolocist IN CO-OPERATION WITH U.S. GEOLOGICAL SURVEY CHARLES D.WALCOTT, DIRECTOR 1902 WFISHING BATTERY ‘ined yeni = Lar AND 4) le ae te oar ered Shadow J spipiey Holl Br * Raker® ~ AY Y y . A ( ~ Seneca Pr. ral » Ml) Hance Pt, ee ENT DO Northe ast Lea) iC | { / “ly j goa Wee, (Gael Be Py bor) = “SOP Lease =e Nie a) ‘~ oa x w :] a> ae A Tt ys \ Se Ko Prac IN { fe \Se \ AOS INTERSECTION mat boas TONE eee : ———— wer é % SY yy eA Chestpet Ail prt tecuar Pre as Ah Dy | Y. | hit . - a