I believe your Clausen names have only one s.

Here are the cemetery records.

Section A row#16 south to north
Wiebke Clausen 1820 - 1911
Peter Clausen 1820 - 1888

There are 9 other Clausen's listed in the records but I have no idea of if/how they are connected.
Amanda M., Arlo E., Dorathea, Earl J., Hans J., Henry, Lorens P. and Marfa M.

As far as I know the earliest records Manning Lutheran Church has start in 1894.
http://www.davidkusel.com/manning1/zion/frame.htm
I did not find any Clausen spellings in the church records but only Claussen.