natural tunnel

natural tunnel

[′nach·rəl ′tən·əl]
(geology)
A cave that is nearly horizontal and is open at both ends. Also known as tunnel cave.
References in periodicals archive ?
The lava probably drains leaving a natural tunnel behind.
Before taking up his studies at ETSU at the end of August, Cameron is attending a band camp at Duffield, Virginia which is part of the Natural Tunnel State Park.
Norfolk Southern) and Virginia's Natural Tunnel State Park hosted "Railroad Day" at Natural Tunnel, 1420 Natural Tunnel Parkway (as announced in its press release dated July 9, 2013).
Bardunias & Su (2005) suggested that because natural termite tunnel networks are excavated within a limited soil horizon, a planar arena might allow for a more natural tunnel expansion than a volume of soil that is deeper but with limited lateral distance.
A long flight of steps leads to a level stretch and, after a natural tunnel formed by trees, we walk between fences.
The organizing committee chose Natural Tunnel State Park, located in SCTC's service area.
One says they travel to and from Morocco via a natural tunnel running through The Rock and under the Straits of Gibraltar, and another that if they ever leave the colony, Gibraltar will no longer be British.
July 9, 2013 /PRNewswire/ -- Norfolk Southern (NYSE: NSC) and Virginia's Natural Tunnel State Park are hosting a Railroad Day for members of the community to learn about safety near railroad tracks and facilities and to enjoy the history and beauty of the area.
The natural tunnel is the next stage in the school's master-plan to transform its grounds into a wildlife haven.
An unprepared Los Angeles is facing its worst nightmare as an endless stream of fiery, deadly lava insidiously creeps across traffic-choked streets while wreaking havoc below ground in the labyrinth of man-made natural tunnels.
Divers pass through natural tunnels in the coral that lead to an inner sand belt and then through crevices in the outer reef.
In addition to the minor engineering works, 4 natural tunnels (ranging in length from 280 m to 1,775 m), 1 artificial tunnel, 17 viaducts, 8 bridges and 4 junctions (Scilla, S.