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Here you will see the baymouth bar which is a landform that is caused by a longshore current. A spit develops first then after time the spit will develop into a baymouth bar which blocks the entire bay.
A longshore current comes from wave energy that pushes water up the shore, but it is forced back because of gravity. Every time a wave splashes onto the shore it leaves stones and sand that is moved further down the shore. This is called a longshore current.
Eventually as you can see from the picture above the longshore current, given time, will form a spit. The spit can be about any size and with the longshore current it will continue to grow until it reaches the other side of the bay. This is how a baymouth bar is formed. This is how the the marsh behind you, Tobico Marsh, was formed. The sediment or rather the sand, stone, rock is not just from the nearby area. Because of changing wind directions and speed with the changing currents and speed of those currents much of the sediment can come from miles away. Also, because the above listed conditions you will see sediment of different sizes and shapes. Some stones may bigger than others which would indicate a stronger current or wind or both. Thus, being stronger it is able to move bigger objects.
To log this earthcache, please send me a message or email me the answers through the app or website to the following questions:
1. What is the bar is made out of (rock, dirt, sand?)
2. Are there stones of different sizes and colors? If so please describe some of them.
3. Post a picture of yourself or a personal item at the given co-ordinates
Information taken from:
https://www.geol.umd.edu/~jmerck/geol100/lectures/30.html
http://willisbrotherssurfing.com/rip-currents-undertows-longshore-currents/