Ein Abschnittswall (auch Abschnittsbefestigung) ist eine Befestigung, die den zu verteidigenden Bereich nicht völlig umschließt, sondern nur an besonders exponierten Stellen errichtet wurde [1]. Solche Anlagen sind auch heute noch obertägig enthalten und finden sich an Bergspornen, Flusschleifen (zum Beispiel das Oppidum von Altenburg-Rheinau) und an steilen Meeresküsten (zum Beispiel das eisenzeitliche Penchateau in französischen Département Loire-Atlantique).

http://de.wikipedia.org/wiki/Abschnittswall

http://www.spessartprojekt.de/kulturwege/alzenau_3/taf_4a.ph...

At southeastern corner of the A structure, east, south and northern walls of the
room, called as Place 2, were explored. Among them, eastern wall (96 cm in width and
4.30 m in length) and southern wall (96 cm in width) belong to outer walls of the
structure and the wall at north (52 cm in width and 4.40 m in length) is a thin sectional
wall. Stone foundation at southwestern corner of rectangular shaped Place 2 is
completely destroyed by late period burials.
http://agt.si.edu/_images/uncover_more/site_reports/_site_re...

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Note added at 31 mins (2011-03-05 11:28:54 GMT)
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Irene Phase occupation at the Kenan Field Site seems to have
occurred during the earliest time of the phase and is denoted by a mixture of Savannah and Irene Phase ceramic traits. This seemingly early Irene Phase component was associated with structural remains and shell middens. The structures consisted of a small, round house located near the corner of a large sectional-wall trench building that was initially thought to be a palisade. Limited additional investigation proved the construction to be a closed structure rather than a palisade and Mission Period ceramics were found along with Irene Phase pottery.
http://shapiro.anthro.uga.edu/Archaeology/PDFs/Lab Series 23...

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Note added at 1 hr (2011-03-05 12:11:08 GMT)
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Yes, I see this as a sectional rampart/fortification i.e. it is there in parts not fully encompassing the site.