I have the material for which you are searching. I wrote a book The Lineage of the Chalker Family: 1640-2004, now in its fourth edition. The next edition is being planned now.
Samuel Chalker of Marlboro County, South Carolina, on the PeeDee River, had five children: Hodges, Rebecca, Roger, Samuel, and Nathaniel. Hodges, Rebecca, Samuel, and Nathaniel moved to Warrenton, Georgia, after Nathaniel received land from the War of 1812. Samuel married Ellizabeth there. They had four children: William, John, Georgia Anne, and Mary. Questionable of these children are all but William. He was definitely a son of this Samuel. He pioneered with Rebecca Land to Ozark, Alabama, possible for land that was opening to public. I cannot relate all the wonderful things that are written about William and Rebecca. They were wonderful people. I have certifications in the book of their activities. They had Samuel Carter, John Wesley, Sarah Rebcca, William David, Eliza Jane, Charles Amos, Mary Ann Cornelia, Roxanna, Amelia, Benjamin Franklin, Calidonia, Eleanor, Arabella, Henriette Anderson.
Some of the most important achievements of this family come through the Blount Family, the billionaire family that donated so much to Alabama.
Please let me know what relationship you have to Samuel and also give me your location. I am Annette Chalker Askew of Birmingham, Alabama. My background is the Chalkers of Kennesaw, Georgia, Cobb County.
On Sylvanus Chalker, I can find no specific connection. however,I can trace him to Yale University, which would indicate that he came from Connecticut. All of the Chalkers,including that South Carolina Chalker, stem from the Chalkers in Connecticut.Many of his children are buried in Barrineau Park, Escambia County, Florida. I do have a record where he taught school and returned to New York. He is a phantom figure that keeps creeping in andout of the genealogy with no specific linkage.