Jun 11-21

Past-E-Mail: Cam Notes - 2021: June: Jun 11-21
McLain State Park Trail    ...scroll down to share comments
Photo by Beth Jukuri
Omars and Driftwood    ...scroll down to share comments
Photo by Beth Jukuri
Superior Omars    ...scroll down to share comments
Photo by Beth Jukuri
Omarolluk, Omar, Graywacke    ...scroll down to share comments
Photo by Beth Jukuri
Name That Rock - Lake Superior Answers    ...click to play video
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Mary Drew at Pasty Central (Mdrew) on Friday, June 11, 2021 - 07:37 pm:

Beth Jukuri is always off on some type of adventure and usually brings back some interesting finds. She was recently on the trails at McLain State Park and stopped to do some rockhounding. She said she had never seen the “Omar” rocks so plentiful before and lined them all up for a photo shoot on the shores of Lake Superior.

Information from Wikipedia, explaining what an Omar is:

Omarolluks, sometimes shortened to omars, are a distinctive type of glacial erratic that consists of dark siliceous greywacke and exhibits prominent rounded, often deep, hemispherical voids and pits. The hemispherical voids and pits result from the selective dissolution of carbonate concretions within the greywacke. Glaciers moved omars from the southeastern part of Hudson Bay to central Canada and into the U.S. where they were deposited on moraines. Because scientists know precisely where they came from they are very valuable in documenting the movement of glaciers.
Interesting how they can tell where they’ve come from like that. When rockhounding myself, I have not found any omars, probably because I’m usually focused on finding agates.

We get to learn about a number of different types of Lake Superior rocks in today’s video, including Omars.
Capt. Paul (Eclogite) on Friday, June 11, 2021 - 08:09 pm:

Nice pics!

I've actually been to the source area for the Omars on the Belcher Islands in Hudson Bay; very interesting place.

I also know the guy who produced the video today very well. He has the YouTube channel Michigan Rocks and has a lot of videos where he primarily visits beaches around northern lower and the UP looking for interesting specimens. If you get a chance, you should definitely check it out.

By jbuck (Jbuck) on Saturday, June 12, 2021 - 07:37 am:

Interesting post!

Capt Paul, what is your opinion of what #7 and #17 really are?

By Donna (Donna) on Saturday, June 12, 2021 - 10:15 am:

OH yes...Michigan Rocks RULES....Watch all his
videos. He's picking rocks mostly, checks out
different polishers/saws, shows exactly how he
makes different (glorious) things out of his rocks
and he plain old knows his stuff!

He does a little metal detecting too. Not real
often, but those are cool as well!

By Capt. Paul (Eclogite) on Saturday, June 12, 2021 - 11:17 am:

By jbuck (Jbuck) on Saturday, June 12, 2021 - 07:37 am:
Interesting post!
Capt Paul, what is your opinion of what #7 and #17 really are?

I would agree with Rob's analysis of those rocks, jbuck. 7 looks like porphyritic rhyolite, 17 a banded or flow-banded rhyolite.

By jbuck (Jbuck) on Saturday, June 12, 2021 - 02:03 pm:

Thanks Capt Paul!

On a somewhat related note, are agates and geodes related in any way?

By Carolyn Rowland (Unpixie) on Saturday, July 3, 2021 - 08:49 am:

I just discovered this thread as I was trying to identify a rock I
found at Freda. Thank you for identifying my Omar.

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