I was out passing some time behind my house and i found these. I have no clue what they are. Can abyone identify them thank you!!

[Mntyinz]

 

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[pepperj]

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Approximately where are you located.
It would help narrow down what they might be.
Country/State

 

[Mntyinz]

Southwest Pennsylvania

 

[Mntyinz]

I live in the laurel highlands with tons of cliffs and ledges behind my house. The little pebbles are in a low spot by a stream the section of pebbles is about 20ft wide and 30ft long and it's all over the top of the ground so I dug down 2ft and it kept going