Pottery? How old does this look? Also a strange spike?

[Vaquero45]

Found some thick pieces of pottery. Anyone have a guess on the age?

Also found what looks like some kind of spike. Never saw one shaped like this though.

 

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[tamrock]

I'd guess the crockery pieces are late 19th early 20th century. I found a 4 sided? spike kind of like yours, but mine is horse shoe shape and has the same kind of points on both ends and I'm not sure what it is.

 

[old digger]

Your spike was part of an older field harrow.