HotRod10…
From
Surveying, Sixth Edition, Moffit and Brouchard, 1975, Section 17-12, Numbering Townships (p. 723):
"The townships of a survey district are numbered meridionally into ranges and latitudinally into tiers with respect to the principal meridian and the baseline of the district. As illustated in Fig. 17-4, the third township south of the baseline is in tier 3 south. Instead of tier, the word township is more frequently used; thus any township in this particular tier is designated as "township 3 south."
I graduated college in 1980 and have been a licensed civil engineer in California since 1983. I have worked with dozens of licensed surveyors, some with longer careers than me. I have worked with hundreds of legal descrptions and exhibit maps, along with parcel maps, tract maps, etc. I have even written a few dozen legal descriptions myself. Over my long career, I have never heard a civil engineer or surveyor use the word
tier in this context, only
township. And, every time I have seen
tier spelled out in a legal description or on a legal map, it has been spelled
township.
Table 3-2 in the BLM's
Manual of Surveying Instructions (2009) indicates numbering by township and range, not by tier and range. This document does use
tier as you do, but uses
township more often (e.g. Appendix I, Specimen Field Notes).
From your third link: "Township - In the U.S. public land surveying system, an area six miles square, containing 36 sections. The townships are organized in tiers and ranges, identified with respect to a baseline and meridian. For example, Township 13 North Range 6 West describes a township's location."
The point of all this is that both
township and
tier are perfectly acceptable in this context, with
township being more commonly used.
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