[train] The Laurentian was a named passenger train operated by the Delaware and Hudson Railway between New York City and Montreal, providing same-day service. The train used the D&H`s famed route along Lake Champlain north of Albany, New York. The Laurentian, along with its overnight companion the Montreal Limited, was the flagship of the D...
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http://en.wikipedia.org/wiki/Laurentian_(train)

• (a.) Pertaining to, or near, the St. Lawrence River; as, the Laurentian hills.
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http://thinkexist.com/dictionary/meaning/laurentian/
Lau·ren'tian adjective Pertaining to, or near, the St. Lawrence River; as, the
Laurentian hills.
Laurentian period (Geol.) ,
the lower of the two divisions of the Archæan age; -- called also the Laurentian . Found on
http://www.encyclo.co.uk/webster/L/20

In geology, Laurentian is a term applied to a vast series of stratified and crystalline rocks of gneiss, mica-schist, quartzite, serpentine, and limestone, about 40,000 feet in thickness, lying northward of the St Lawrence in Canada. The Laurentian is the lowest fossiliferous system of rocks, if its characteristic and only fossil, the Eozoon canade...
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http://www.probertencyclopaedia.com/browse/HL.HTM
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