Atlantic Seaboard Fall Line: Difference between revisions

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{{Short description|Escarpment in the Eastern United States}}

{{Cleanup reorganize|date=August 2025}}

{{Infobox landform

| water =

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| area =

| depth =

| drop = 14fallline.html

| formed_by = [[New Jersey]], [[Virginia]], the [[Carolinas]], [[Georgia (U.S. state)|Georgia]], [[Alabama]], U.S.<ref name=USGS>{{Cite web|title=The Fall Line |url=http://tapestry.usgs.gov/features/14fallline.html |work=A Tapestry of Time and Terrain: The Union of Two Maps - Geology and Topography |publisher=USGS.gov |access-date=2010-08-12 |url-status=dead |archive-url=}}{{dead link|archive-date=2011-05-14August 2025}}</ref><ref name="georgia">{{Cite web|title=Georgia Geology |url=http://www.gly.uga.edu/default.php?PK=0&iPage=5#FallLine |access-date=2010-08-13 |archive-url=https://web.archive.org/web/20100904194712/http://www.gly.uga.edu/default.php?PK=0&iPage=5 |archive-date=4 September 2010 <!--DASHBot--> |url-status=live }}</ref><ref name=freitag/>

| geology =

| age =

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{{Quote|The most prominent, though not perhaps the most insuperable obstacle in the navigation of the Atlantic rivers, consists in their lower falls, which are ascribed to a presumed continuous granite ridge, rising about one hundred and thirty feet above tide water. That ridge from New York to James River inclusively arrests the ascent of the tide; the falls of every river within that space being precisely at the head of the tide; pursuing thence southwardly a direction nearly parallel to the mountains, it recedes from the sea, leaving in each southern river an extent of good navigation between the tide and the falls. Other falls of less magnitude are found at the gaps of the [[Blue Ridge Mountains|Blue Ridge]], through which the rivers have forced their passage...}}

Gallatin's observation was sound, though simplified and limited by the knowledge of his time. The limits of the Fall Line are subject to some dispute. In the north, the fall line is usually understood to have its northern limit at New Brunswick, a geologic continuation in fact crosses the [[Hackensack River|Hackensack]] and [[Passaic River|Passaic]] Rivers at the cities of those names, to which navigation was possible. In the south, some such as Gallatin above, and the USGS source in the infobox, imply its end to be in the Carolinas or Georgia, and to include only rivers running to the Atlantic; but it is more accurate, as the Georgia source in the infobox does, to trace it farther west through Georgia and Alabama, as that is the geologic continuation.<ref>[https://www.loc.gov/ghe/cascade/index.html?appid=8caec0ea0f45442396e539c227ee192c], especially the first section and maps.</ref>

== Cities and towns ==

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* [[Havre de Grace, Maryland]], on the [[Susquehanna River]]/head of [[Chesapeake Bay]].

* [[Baltimore|Baltimore, Maryland]], on [[Herring Run]], [[Jones Falls]], and [[Gwynns Falls]].<ref>{{cite web |url= http://www.mgs.md.gov/geology/ |title= Maryland Geology |publisher= Maryland Geological Society |access-date= 25 January 2017}}</ref>

* [[Elkridge, Maryland]], on the [[Patapsco River]].{{Citation needed|date=January 2017}}

* [[Laurel, Maryland]], on the [[Patuxent River]].{{Citation needed|date=November 2010}}

* [[Washington, D.C.]], on the [[Potomac River]].<ref name=deane>{{cite book |last= Deane |first= Winegar |title= Highroad Guide to Chesapeake Bay |year= 2002 |publisher= John F. Blair |isbn= 978-0-89587-279-1 |page= 5 |url= https://books.google.com/books?id=bMejFkODGIcC&pg=PA5 |access-date= 17 November 2010}}</ref>

* [[Occoquan, Virginia]], on the [[Occoquan River]].{{Citation needed|date=November 2010}}

* [[Fredericksburg, Virginia]] on the [[Rappahannock River]].<ref name=deane/>

* [[Hanover, Virginia]], on the [[North Anna River]]{{Citation needed|date=January 2017}}

* [[Richmond, Virginia]], on the [[James River]].<ref name=roberts>{{cite book |last= Roberts |first= David C. |author2=W. Grant Hodsdon |editor= Roger Tory Peterson |title= A Field Guide to Geology: Eastern North America |year= 2001 |publisher= Houghton Mifflin Harcourt |isbn= 978-0-618-16438-7 |page= 242 |url= https://books.google.com/books?id=zNJO2VBVRPIC&pg=PA242 |access-date= 17 November 2010}}</ref>

* [[PetersburgGoldsboro, VirginiaNorth Carolina]] and [[Smithfield, North Carolina]], on the [[AppomattoxNeuse River]].<ref name=vaplacesncpedia>{{cite web |url= http://www.virginiaplacesncpedia.org/regions/fallshape.htmlfall-line |title= Geology of the Fall Line |publisher= Virginia PlacesNCpedia |access-date= 25 January 2017}}</ref>

* [[Weldon, North Carolina]], and [[Roanoke RapidsFayetteville, North Carolina]], on the [[RoanokeCape Fear River]].<ref name=ncpedia>{{cite webcitation needed|url= http://www.ncpedia.org/fall-line |title= Fall Line |publisher= NCpedia |access-date=August 25 January 20172025}}</ref>

* [[Tarboro, North Carolina]] and [[Rocky Mount, North Carolina]], on the [[Tar River]].<ref name=ncpedia/>

* [[Goldsboro, North Carolina]] and [[Smithfield, North Carolina]], on the [[Neuse River]].<ref name=ncpedia/>

* [[Lumberton, North Carolina]], on the [[Lumber River]].

* [[Cheraw, South Carolina]], on the [[Pee Dee River]].{{Citation needed|date=November 2010}}

* [[Camden, South Carolina]], on the [[Wateree River]].{{Citation needed|date=November 2010}}

* [[Columbia, South Carolina]], on the [[Congaree River]].<ref name=georgia/><ref name=roberts/>

* [[Augusta, Georgia]], on the [[Savannah River]].<ref name=georgia/>

* [[Milledgeville, Georgia]], on the [[Oconee River]].<ref name=georgia/>

* [[Macon, Georgia]], on the [[Ocmulgee River]].<ref name=georgia/>

* [[Columbus, Georgia]], on the [[Chattahoochee River]].<ref name=georgia/>

* [[Tallassee, Alabama]], on the [[Tallapoosa River]].

* [[Wetumpka, Alabama]], on the [[Coosa River]].

* [[Centreville, Alabama]], on the [[Cahaba River]].

* [[Tuscaloosa, Alabama]], on the [[Black Warrior River]].<ref name=georgia/>