Nature and science
The cedar tree rings that changed a building’s century
Documented history and research · Sources compared
A regional wood-dating project overturned a colonial attribution and strengthened a much longer environmental record.
The missing reference
When Edward Cook and William Callahan sampled Greenwich’s supposed Swedish Granary in 2008, they could not date it. A dependable regional cedar reference chronology was missing. Later work combined living trees, historic timbers and buried wood. Batsto buildings supplied several comparison sequences; logs from a Port Norris salt-hay meadow helped connect older building sequences with living trees. Cook and Callahan, cedar dating report (2017).
A later construction date
Their 2017 report dated fifteen granary samples. Most outer rings clustered in the early 1780s. The authors inferred construction in or shortly after 1783, perhaps as late as 1785, while discussing missing outer rings and possible timber stockpiling. The evidence contradicted the proposed seventeenth-century origin without identifying one indisputable building day. Cook and Callahan, cedar dating report (2017).
A useful result beyond one exhibit
The historical society accepted the revised date and began reinterpreting the structure. A 2020 research paper subsequently described the southern New Jersey cedar chronology extended to 1644 using historic-building samples. That work contributed to a much broader northeastern tree-ring record. The regional timbers helped date both an artifact and environmental evidence; the larger record should not be mistaken for one continuous forest at Greenwich. Cumberland County Historical Society update; Pearl and colleagues, cedar chronology (2020).
Sources and research limits
- Cook and Callahan, cedar dating report (2017) — Full report’s introduction, chronology development, sample table and dating conclusion read.
- Cumberland County Historical Society update — Institutional reinterpretation read; indexed versions differ in page title.
- Pearl and colleagues, cedar chronology (2020) — Indexed introduction and southern New Jersey archaeological-wood section read; full author PDF download timed out.
The 2017 report and society account differ on the building’s relocation year, so that date is omitted. Tree harvesting and construction are distinguished.