National Capital Parks-East District of Columbia U.S. Department of the Interior Geologic Map of National Capital Parks-East

National Capital Parks–East is a collection of parks and sites that encompass over 8,000 acres of protected land in the Washington, D.C., area. The group includes , , Kenilworth Park and Aquatic Gardens, Kenilworth Marsh, Mary McLeod Bethune Council House National Historic Site, Frederick Douglass National Historic Site, Capitol Hill Parks, Fort Circle Parks also known as the Civil War

Defenses of Washington (including several Civil War forts, , Fort Stanton, Fort Dupont, etc.), , Shepherd Kps Parkway, Oxon Cove Park and Oxon Hill Farm, Oxon Run Parkway, Sewall-Belmont House National Historic Site, Baltimore-Washington Kps Parkway, Suitland Parkway, (with Hard Bargain and National Colonial Farms), Harmony Hall, and others located over 98 sites.

This map graphically presents digital geologic data prepared as part of the NPS Geologic Resources Division’s Geologic Resource Evaluation Program. The source map used in creation of the digital geologic data product was: Kps Qdgf Kps Baltimore-Washington Southworth, S. and D. Denenny. 2006. Geologic Map of the National Parks in the National Capital Region, Washington D.C., Virginia, Parkway and West Virginia. Scale 1:24,000. U.S. Geological Survey. Open-File Report: OF 2005-1331. Qa

Digital geologic data and cross sections for National Capital Parks-East and all other digital geologic data prepared as part of the Geologic Kps Resource Evaluation Program, are available online at the NPS Data Store: http://science.nature.nps.gov/nrdata/ Kps

Kps

CZms Kps Qt A-A'CZmg Kps

CZms Kpc

Kps CZmg Kpc

Kps Ttu CZmmg Qa Qa Greenbelt Kpc CZmms Park CZmms CZd CZmmg Kps CZmmp CZmss CZmms Qa Cst Ogh Csd Kpc

Cl Qa Kps Odm Ok

CZu Qa Kpc Kps Kpc Tt Kpc Kps

Odm Ttu Qa Cl Ttu Tc Tc Kpc Kps Qa Ogb Ttu Csd Ogr Kps Ogb Tc QTt Csd Csd Tt Tt Ogh Qa Qc Csd Qdgf Tt Kpc Qdgf Ok Qa Ogg C-C' Qfe Qt Csd Qdgf Qt Csd Qa Tt Kpc Qc Csd Qdgf Tt Qc Tt Qa Kps Qdgf Capitol Hill Parks Qdgf Kpc Qfe Qt Unit Boundaries of National Capital Parks - East Ql - Landslide Tt

Kps Qte - Low-level fluvial and estuarine deposits Qte Qa Qt Geologic Cross Section Lines Tt Tc Qfe - Upper-level fluvial and estuarine deposits A-A' Qdgf Fort Circle Parks QTt - Terrace deposits, upper level B-B' Tt Qt Kpc Tt - Terrace deposits C-C' TKb QTt Qte Faults Ttu - Highest level upland terrace deposits Ttu Tc Kp Tt unknown offset/displacement, known or certain Tyb - Yorktown and Bacons Castle Formations, undivided Ta unknown offset/displacement, concealed Tc - Calvert Formation Qte QTt Tc Qa unknown offset/displacement, inferred Qa Suitland Parkway Tn - Nanjemoy Formation Ttu Qc Surficial Contacts Tm - Marlboro Clay Tc Ttu Ttu known or certain Oxon Run Parkway QTt Ta Qa Tc Ttu Ta - Aquia Formation Kp Tc map boundary Kpc TKb - Brightseat and Monmouth Formations, undivided Qt Qc QTt water or shoreline Km - Monmouth Formation Surficial Geologic Units Qte Qdgf - Disturbed ground and artificial fill Ks - Severn Formation Tt Qdgf Qa - Alluvium Kp - Potomac Formation, undivided Oxon Cove Park Qt - Terrace deposit, low level Kpc - Potomac Formation, clay-dominated lithofacies Qa

Qc - Colluvium Kps - Potomac Formation, sand-dominated lithofacies

Qa 0 5 10 15 Qd - Debris Qc Qt Km

Kp Kp Ta KpTKb 0 5 10

TKb Mi Qc Qa Ttu Tt Tt

TKb

Tt Kp Kp Location of Geologic Mapping Qc Qte Qte Qt Kp Qte Kp Qte Month Year QTt Geologic Contacts Qte Ob - Bear Island Granodiorite Qte M a r y l a n d known or certain Qte Qte Ogl - Granite Qa concealed Cs - Sykesville Fm, Diamictite QTt Qfe map boundary Cst - Sykesville Fm, Diamictite tectonite Qte water or shoreline Kp Csg - Sykesville Fm, Metagraywacke and schist Qte D i s t r i c t o f C o l u m b i a Bedrock Geologic Units Csp - Sykesville Fm, Chlorite-sericite phyllonite PZq - Vein quartz bodies QTt QTt Qte Qa Ks Cl - Laurel Fm Dl - Lamprophyre dike Qte CZd - Diamictite Op - Pegmatite Tyb B-B' QTt Ta Fort Washington Park CZms - Mather Gorge Fm, Schist V i r g i n i a Qte Oc - Clarendon Granite CZmg - Mather Gorge Fm, Metagraywacke Piscataway Park Ok - Kensington Tonalite Qa CZmmg - Mather Gorge Fm, Migmatitic metagraywacke Qte Odm - Dalecarlia Intrusive Suite, Biotite monzogranite and lesser granodiorite Qte Marshall Hall CZmms - Mather Gorge Fm, Migmatitic schist Qa Ta Odt - Dalecarlia Intrusive Suite, Muscovite trondhjemite Tm Ta CZmmp - Mather Gorge Fm, Migmatitic phyllonite Ogh - Georgetown Intrusive Suite, Biotite - hornblende tonalite Tyb Tc CZmss - Mather Gorge Fm, Sheared Migmatitic schist and Migmatitic phyllonite Tn Ogg - Georgetown Intrusive Suite, Quartz gabbro Qte Tyb CZu - Ultramafic rocks Ogb - Georgetown Intrusive Suite, Biotite tonalite

Qte CZa - Amphibolite Ogr - Georgetown Intrusive Suite, Garnetiferous biotite - hornblende tonalite

CZg - Metagabbro and metapyroxenite Ogus - Georgetown Intrusive Suite, Soapstone and talc schist

CZt - Soapstone, talc schist, and actinolite schist Ogu - Georgetown Intrusive Suite, Ultramafic rocks

Ogp - Georgetown Intrusive Suite, Pyroxenite

Produced by Geologic Resources Division June 2008