Unknown (to me) Pierce grave markers

Pittsfield MA cemetery

None are listed in:

PITTSFIELD DEATHS 1886 – 1941
http://www.rootsweb.ancestry.com/~maberksh/towns/pittsfield/pitt_deaths/index.html

Father Levi M. Pierce February 6, 1827 – September 16, 1900

Mother Lydia Ann (?) Pierce January 5, 1830 – September 11, 1883

Daughter Elva Adelia Pierce October 13, 1853 – September 4, 1865

Daughter Lilla Belle Pierce July 15, 1860 – January 23, 1938

Daughter Adelia Pierce Schroff July 15, 1870 – July 10, 1932