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Following the Mitochondrial Path for J Landry's wife Marianne

Privacy Level: Open (White)
Date: 9 Jun 2021 [unknown]
Location: Georgiamap
Surname/tag: Landry Georgia New Netherlands France
Profile manager: Amanda Torrey private message [send private message]
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Under Construction

This is the project page for the Descendants of Marianne (Unknown) Landry (1695-bef.1735); our ultimate goal is to establish DNA Confirmations between one of Georgia's first families and their descendants. Hopefully we can use this genealogy as a resource to bridge to her most remote ancestors.

Mitochondrial Tracing

Marianne's ancestry can be traced from mother to daughter with reasonable certainty to (Beginning with Most Recent):

Amanda (Moyer) Torrey (1952-
Grace (Rogers) Moyer (1909-1985
Alma (Groover) Rogers (1892-1952) - Georgia (Salzburgers)
Margaret E. (Wise) Groover (1862-abt.1918) - Georgia (Bulloch County Primitive Baptists)
Susan Catherine (McElveen) Wise (abt.1820-1893) Father - Presbyterians from South Carolina (Scots immigrated from County Downs)
Susannah (Harvey) Bragg (abt.1788-1861)- Georgia Bryan County
Elizabeth (Morell) Harvey (abt.1760-1835) - Suspected Georgian Huguenots
Elizabeth (Landry) Morel (aft.1730-aft.1777) Passenger on the Transporter, James dep'd Rotterdam 28 Sep 1733 arr'd in Savannah 14 Jan 1734 Settled in Highgate GA
Marianne (Unknown) Landry (1695-bef.1735)

Marianne's husband, Jacques Landry (abt.1690-) of Cadzand, Zeeland, Netherlands [1]. DNA evidence suggests he may be descended from Huguenots who left Marck, Pas-de-Calais, Nord-Pas-de-Calais, France for Cadzand during the French persecution of French Protestants in the 17th Century.


  • MRCA = most recent common ancestor(s).
  • cohort = a group of DNA samples all descended from the same MRCA.
  • cohort-pair = two DNA samples from different cohorts that are tested against each other
  • opposite autosome = the non-selected autosomal chromosome of the two which constitute an autosomal pair. In matches between two or more cohort-pairs, it refers to the illusion of a match between samples of one cohort-pair with another cohort-pair on the same segment of the same chromosome. The falsity of the match is revealed when testing a sample from the first cohort-pair against a sample from the second cohort-pair, which demonstrates that each cohort-pair contains a separate, distinct match on each of the autosomal chromosomes of the autosomal pair.
  • valid match = a match between two DNA samples in which the minimum segment is 5 cMs, the minimum segment size for negligible false-positives.[1]
  • threshold match = a match between two DNA samples in which the minimum segment is 7 cMs, the historically accepted minimum segment size for a moderately confident likelihood of a single MRCA.[2]
  • multi-chromosomal match = a valid and/or threshold match between two DNA samples on more than one autosomal pair.

DNA Samples

Primary Cohort

Secondary Cohorts

Small Samples

Marital Samples

Additionally, 123 samples from affiliated marital lines that match the relevant Bird samples along the paternal line are included, collectively referred to as "the marital samples."


DNA matching was undertaken at GEDmatch using the default measures for One-to-One Autosomal Comparison except for the minimum segment cM size which was set to a numerical value of 5, the minimum segment size for negligible false-positives.[1]Documented false positives were likewise eliminated.[15] When dealing with large data sets, telltale traces of ancient, degraded DNA commonality seem to be:

  • statistically significant,[16] valid matches[1]between samples from different cohorts; and
  • matches between different cohort-pairs along the opposite autosome; and
  • repetition of matches between different cohort-pairs on different segments of the same chromosome, particularly where those segments adjoin or are nearly-adjoined; and
  • residual threshold matches.

As a rule of thumb, "identical by descent" blocks longer than 4 cMs date from 500-1,500 years, while blocks longer than 10 cM date from within the last 500 years.[17]In my own experience, however, meaningful identification of "identical by descent" trends from significantly-large sample-groups has been limited to about 700 years.

Francis Bird/Rhoda Schermerhorn

Baseline Relationships

The first series of tests establish percentages for two cohorts known to share Francis Bird/Rhoda Schermerhorn as the MRCA: Cohort 1A and Cohort 1B. The DNA split occurred in 1820 and 1823. Five descendants of Joshua Merritt Bird/Elizabeth Cheatham[4] were tested against 12 samples from descendants of John Owens Bird/Permelia Hardin[5]revealing:

  • a 72% valid match rate;[18]
  • a 47% threshold match rate;[19]and
  • a 33% multi-chromosomal match rate.[20]

Marital Lines

The second tests determine common marital lines that preceded the DNA split of 1820-1823, with Cohort 1 being tested against various samples from the marital lines to reveal:



Speculative Relations


  1. 1.0 1.1 1.2 Durand EY, Eriksson N, McLean CY. Reducing pervasive false positive identical-by-descent segments detected by large-scale pedigree analysis. Molecular Biology and Evolution advance access publication online 30 April 2014.
  2. Autosomal DNA match thresholds, International Society of Genetic Genealogy Wiki, edited on 17 August 2020.
  3. Descendants of Francis Bird/Rhoda Schermerhorn: HC3420302, M836948, A527106, A485847, A984070, DP3782771, WR5516898, MX6303372, NK5428542, A988507, A872917, A810073, M811320, A447996, EA5680299, KG2043463, PY1470082, EY6972268 and MB6538726.
  4. 4.0 4.1 Descendants of Joshua Merritt Bird/Elizabeth Cheatham: HC3420302, M836948, A527106, A485847 and A984070.
  5. 5.0 5.1 Descendants of John Owens Bird/Permelia Hardin: DP3782771, WR5516898, MX6303372, NK5428542, A988507, A872917, A810073, M811320, A447996, EA5680299, KG2043463 and PY1470082.
  6. Descendants of Andrew Bird/Hannah Deming: A191183, A531774, M713271, HB8925926, M723144, A144846, A438082, A212294, A512917, A370905, T456636, AY5034064, rd4841823, A193034, A552383, T796206, ZU7881242, EM5557459, A826412 and YY4377625.
  7. Descendants of Isabel Bird/Thomas Miller: JY4409689, A980822, M554869, T656310, T452821, A640691, A663305, A150845, CK2683756, FT5156181, KW6605285, A110152, A233172, A849837, HA8993941, Z897811, A727454, M987284, A732298, A226866, A705476, A095706 and T012949.
  8. Descendants of Prudence Bird/Martin Kellogg: BG7084700, M114038, T051391, A258161, EL3049426, A661667, T176662, A297672, A775212, GY9363185, A020540, A910306, A579600, WW7580824, A183502, T706019, A427856, A811342, T804458 and M808211.
  9. Descendants of Thomas Bird: Z004734, A636200, A781547, UY6486189, T688010, A905426, A269729, T456636, YY4377625, BK9812419, A916816, A188087, A226850, A545340, RR6501308, M642090, A353783, KU5544160, TM5258586, A706767, A272296, A053303, T236933, A484936, M121528, A129800, A214154, A642526, m100543, A604920, and M694349.
  10. Unknown descendant of Francis Bird/Rhoda Schermerhorn: MB6538726
  11. Descendant of Sarah Bird/Separate Hendrickson: MB6538726. Also separately descended from Francis Bird/Rhoda Schermerhorn as well as Bailey Hardin/Jemima Thompson.
  12. Unknown descendant of Francis Bird/Rhoda Schermerhorn: MB6538726.
  13. Descendants of Thomas Bird/Thankful Atherton: A150172 and A283200.
  14. Descendant of Josiah Bird/Phoebe Milner: T852918
  15. Matching segments identified as possible "large-scale population pile-up region(s)“ indicative of identity by chance rather than identify by descent were eliminated. See Li H, Glusman G, Hu H, Shankaracharya, Caballero J, Hubley R, et al. (2014) Relationship Estimation from Whole-Genome Sequence Data. PLoS Genet 10(1): e1004144.
  16. Statisical significance, Wikipedia, retrieved on 17 March 2021.
  17. Ralph P, Coop G (2013). The Geography of Recent Genetic Ancestry across Europe. PLOS Biology 11(5):e1001555.
  18. 43 out of 60 possible cohort-pairs.
  19. 28 out of 60 possible cohort-pairs.
  20. 20 out of 60 possible cohort-pairs.
  21. HC3420302/A097930/A810073 on Chromosome 14 @ 11.3 cMs
  22. 66 out of 640 cohort-pairs.
  23. Descendants of Evan Ragland/Susan Pettus: A097930, M043835, A531171, DG4070555, A421484, A796145, M004561, DM8001862, A039778, A760548, A454636, A594768, WF3766620, A939387, KD3962272, M352409, A526935, ZT8445723, A454636, A511356, SB4487861, H593937, A724705, H397648, Z870673, A520290, A474949 and KL2821804.
  24. Descendants of Thomas Pettus/Mary Dabney: M184838, A357705, XK1343955, A316177, A143986, A559662, RG6372435 and A381567.
  25. M416339/EA5680299/KG2043463 on Chromosome 1 @ 9.4 cMs
  26. 27 out of 80 cohort-pairs.
  27. Descendants of James Beall/Mary Ann Edmonston: A419054, A981644, A627169, QT9195941, A468622, M108409, TS8444217, M193357, A703197, A347318, HW1234907, A929826, GP5942141 and M416339
  28. Descendants of Archibald Edmonston/Jane Beall: A102662, A946916, T373459, A419054, M836948, M240510, A559070, KL9455241, T580088 and T118514
  29. Descendants of James Offutt/Rachel Beall: DK5787111 and Mf3385398
  30. 19 out of 280 cohort-pairs.
  31. Descendants of Thomas Odell, Jr./Margaret Beall: T528972, T306340, T117946, T233816, T340913, A674168, JK5513821, WV8778760, CC4089414, FR3254794, A031835, A390325, M785696 and JJ6305922
  32. 18 out of 140 cohort-pairs.
  33. Descendants of John Smith Prather/Elizabeth Nuthall: T117672, A350254, RE8140123, PQ7636094, T206300, DF7006601 and M220261.
  34. Descendants of Thomas Prather, Sr./Martha Sprigg: Z716128, A931190, A315501, A058317, T478507, M009021, A642104, A056185, M763404, A045117, MG3570274, M864536 and A538216
  35. Descendants of Jonathan Prather/Jane Mackall: T888189, M344233, M819991, A620384, H646960, A446185 and A955543.
  36. 23 out of 220 cohort-pairs.
  37. Descendants of William Elgate, Jr./Sarah Keene: M959897, UC7944954, M826829, T373459, A894909, A129630, NW5504569, TZ1867422, H071394, A948527 and H064601
  38. A486511
  39. 10 out of 140 cohort-pairs.
  40. Descendants of James Dashiell/Ann Cannon: A002005, T373459, T623521, T833357, M544309, A799539, H593937, YX4962947 and A361857.
  41. 10 out of 220 cohort-pairs.
  42. Descendants of John Rogers/Ellen Haile: A002005, T373459, T623521, T833357, M544309, A799539, T670915, H593937, YX4962947, A361857 and A636851.
  43. 14 out of 160 cohort-pairs.
  44. Descendants of Jacob Janse Schermerhorn/Jannetje Van Egmont]: A030639, M354731, A320133, A633086, SV9062338, HY326068C1, A090371 and NL7021768
  45. Descendants of Lucas Jacobse Schermerhorn/Elizabeth Janse Damen: NY9031007 and FT2436647.
  46. Descendants of Luykas Schermerhorn/Sarah Thyzen: A608397 and A222503.


Common Genome of Descendants of Francis Bird [2]

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Categories: MtDNA Haplogroup H1c1