The hidden genetic echoes of Maryland's 17th-century colonial roots

Health · Published 19 October 2026 Swipe more like this →

In short: How much of your DNA is a map of 400-year-old migrations? In the early settlements of Maryland, gaps in written history once obscured the identities of the first colonists. Today, modern genetics is filling those silences, linking contemporary residents to the very first English inhabitants of the Chesapeake.

The colonial history of Maryland’s southern region is marked by significant genealogical gaps. While many Americans can trace their lineage back to early settlements like St. Mary's City (founded in 1634), researchers have struggled to identify specific individuals from these founding populations due to lost records. To bridge this gap, scientists are now using an identity-by-descent (IBD) approach to analyze the genomes of historical figures.

A recent study analyzed the DNA of 49 individuals from 17th-century St. Mary's City. By comparing these samples against a database of over 1.3 million genetic relatives, researchers identified strong connections to western England and Wales, pinpointing likely origins for early inhabitants. The data also revealed significant genetic links to Kentucky, which mirrors documented post-Revolutionary War migrations of Maryland Catholics to that region.

This intersection of genetics and history allows for the reconstruction of lost identities. For example, three sequenced inhabitants from history were potentially identified by scientists, such as Maryland's second colonial governor, Thomas Greene. Such a technique reveals how ancestral geographic markers can rebuild historical links that time had wiped away.

This genetic legacy exists alongside a complex physical geography. In neighboring Calvert County, the landscape is defined by three distinct terraces—the Talbot, Wicomico, and Sunderland—formed during periods when sea levels rose and fell. These geological shifts left behind marine deposits and fossils, creating a literal foundation of history that mirrors the human migrations occurring above it.

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