I don't about your Abigail Coulter, but am looking for Nathaniel Coulter b. 1800 in Pennsylvania, married to Susan Buchanan b. 1810 Kentucky, had a daughter Sarah A. Coulter b. Bulter Co., Ohio.

SOURCES: 1850 Census Liberty Twp., District No. 15, Butler, Ohio, Pg 35 shows Dwell #253, Fam.#255, Nathaniel Coulter, 50,M, Carpenter, born in PA, Susan, 40, F, born in Ky, Joshua, 17, M, Carpenter, born in Ohio, Malinda, 11, F, born in Ohio, James Buchanan, 77, M, born in NJ. Census taken 13 September 1850 by James Lewis.

Sarah Coulter Berry died 16 May 1859 In Butler Co., Ohio.

See bio of William Berry for Cass Co. Iowa.
William Berry bought the land he now occupies, in 1857, but did not come here to live till 1872.

William Berry was born in Hampshire county, Virginia, October 18, 1819. He is the son of George and Sarah (Floyd) Berry. When three years old he removed with his parents, to Clinton county, Ohio. He remained there until 1851, when he removed to Butler county, Ohio. He was a stone mason by trade and always followed that occupation until he came to Cass county. He was married in Butler county, May 18, 1852, to Sarah Coulter, a native of that county, and daughter of Nathaniel and Mary (Buchanan) Coulter, who died in Butler county. Mrs. Berry died May 16, 1859, leaving four children-Amand J., wife of John Jay, living in Dakota. Susan A., wife of James Jay, also in Dakota, John W., in Butler county, Ohio, and Alice, who died August 16, 1860. Mr. Berry again married December 12, 1867, to Mrs. Margaret Zeek, widow of H. H. Zeek. Mr. Berry moved to this county in 1872, and settled upon land which he had purchased in 1857. He now rents his farm which contains one hundred and sixty acres. He is politically a Democrat.

Maybe the same Nathaniel.