Trilobite identification request

[hoverchocs]

Hello, I was handed a pile of rocks found on a trip to Lake Michigan. My husband’s coworker passed on a box of rocks from Lake Michigan. I think there are a few fossils but am not sure.

 

May I have some assistance with confirmation and/or identification please?

 

Some of the pictures are the rocks rotated for more detail. 
 

Thank you for lending me your knowledge. 

 

 

Edited August 9 by hoverchocs
Added a picture

[Fossildude19]

First item looks like a coral.
Not seeing any trilobites here, though.

[Ludwigia]

I agree with coral for 1. 6,7 and the last one appear to have cross-sections of somethng or other, but can't tell what. The others have no fossils in them.

[Bullsnake]

@Fossildude19 @Ludwigia

I may be off-base, but on the first item I think I'm seeing distinct segmentation. I can't accurately count the segments but my first thought was maybe a chiton, or perhaps cephalopod.

I'm hesitant to doubt you guys, though. 

[Ludwigia]

9 minutes ago, Bullsnake said:

@Fossildude19 @Ludwigia

I may be off-base, but on the first item I think I'm seeing distinct segmentation. I can't accurately count the segments but my first thought was maybe a chiton, or perhaps cephalopod.

I'm hesitant to doubt you guys, though. 

Hmmmm....in this case, your guess is as good as mine.

[Isotelus2883]

They are the tabulae which can look like segmentation.

[hoverchocs]

My husband felt like he was seeing the segmentation as well. 
 

Can you explain what he is seeing? He would like to understand what he is looking at. He sees the edges with the fringe and then what looks like segmentation down the “top” and some on the back. Is there a specific type of coral this is that he could do some internet sleuthing to see what it would look like?

 

[Kane]

You could look up rugose coral. This has been eroded to show some of the inner structure. It may not be possible to identify it further than that without more precise provenance and possibly even using acetate peels. 

[Fossildude19]

Rugose coral anatomy:

 

 

 

Your specimen:

 

[Fossildude19]

2 hours ago, Bullsnake said:

@Fossildude19 @Ludwigia

I may be off-base, but on the first item I think I'm seeing distinct segmentation. I can't accurately count the segments but my first thought was maybe a chiton, or perhaps cephalopod.

I'm hesitant to doubt you guys, though. 

 

Doubt is always good, and healthy, Steve.

But the above image shows what I am seeing.

[hoverchocs]

1 hour ago, Fossildude19 said:

Rugose coral anatomy:

 

 

 

Your specimen:

 

This is most helpful! Thank you. Better than any picture I could dredge up for him. 
 

I appreciate everyone answering his questions. You guys are awesome. 

[debivort]

I think the last one might be a cross section through a crinoid stem