Cemetery was located by the Whitehall Museum building in Middletown, RI. No stones are still standing. If you read below, all the stones were removed and put in a rock wall on the property. Only one stone has been found so far of the ones removed, that of Samuel Hubbard.
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From the Literary Diary of Ezra Stiles, Vol. 3, p.82:
"A singular gravestone:

"Ebenezer"
Samuel Hubbard aged 10 of May 78 yeres
Old Tase Hubbard aged the 27 Sep 79 yeres and 7 mons 4 Jen Maryed 51
Yeres 1688 14 Vpsal 4. God have given us 7 children 4 ded 3 living
Ruth Burdick 11, 1 ded, 10 living
Rachael Langworthy had 10 children 3 ded 7 living. Bethiah Clark 9 Living
Great Grandchildren
Naomi B Rogers 1 ded 4 alyfe
Ruth B Phillips 1 ded 4 alyfe
Judah C Maxson
Thomas Burdick

"I took this inscription off a gravestone in a family burying place on Baptist Berkleys White Hall farm on Rh. Isld, about A. D. 1763. Collector Robinson bought the Lease about 1765 and demolished the gravestones and put them into a wall: so that all is lost. From a loose paper which I, wrote in 1763 I now copy here. This Samuel Hubbard was a Baptist Teacher, settled at Newport about 1648 and made this Eben. 1688. Intricate as it seems, more is contained on this stone than can be given in other words in so small a space. I think 1688 must be a year common to Four dates. I should suppose the stone erected Sep 27, 1688, when the wife was aged 79 and 7 mo., and Mr. Hubbard was aged 78 on May 10 that year and on 4 Jany they had been married 51 years. The 14 Vpsal 4 is the 145th Psalm and the 4th verse---'One generation shall praise thy works to another.' The B and C, I think a beautiful way of expressing lineal Descents. Thus Naomi B Rogers, I take to be Naomi Burdick who married Rogers---so Judah C Maxson was the Daughter of Bethiah Clark and it will be read Judah Clark Maxson."