Space rock impact site(s)

[Cedars]

Ok another day wasted cuz you sparked my imagination Turtle!

But I got one for you to check out. 44.25 N and 91.26 W. Its huge. If you use googleEarth and zoom in until the markers for Eau Claire Wisc and Winona MN show up, these two cities border the edge of this circle.

I did a bit of searching and this one is in the Driftless Area, meaning it was not glaciated during the last Ice Age. On the map I linked to in the other thread, it shows a meteor impact just west of this one and there are some articles on it.

But thats not the circle here.

Heres a satellite image that shows it even better:
Wisconsin Satellite Images - Satellite Photo Map - GEOLOGY.COM
Hmm and you can see it on the same sites Minnesota satellite image.
The rounded lake straight south west of the tip of Lake Superior is Lake Millacs. That lake is 26 miles long or wide (I forget).

Minnesota Satellite Images - Satellite Photo Map - GEOLOGY.COM

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[Turtle]

Originally Posted by Cedars

Ok another day wasted cuz you sparked my imagination Turtle!

Just doin' mah job!

Originally Posted by Cedars

But I got one for you to check out. 44.25 N and 91.26 W. Its huge. If you use googleEarth and zoom in until the markers for Eau Claire Wisc and Winona MN show up, these two cities border the edge of this circle.

Nice! But, uh...I see at least 2 craters there and possibly 3! Sweet holes in the ground Betty!!! I added red arrows to a Google map screen shot & attached it below.

Originally Posted by Lambus

Affirmative, this geology would place the age of the Cráter del Tortuga Jorge at around 65 Million years old.

Bien! So perhaps we have an event akin to Shoemaker-Levy hitting Jupiter!! I e-mailed USGS with the new find; can't expect to hear from anybody until at least Monday I think. I drew a line through Chicxulub Cráter & Cráter del Tortuga Jorge, and it looks like maybe another crater on that line at about >>

24º 24' 54" N
98º 41' 20" W

[Cedars]

Originally Posted by Lambus

Eau Claire Crater (GPS): 44.45 N, 91.45 W
Crater Diameter: 97.48 x 87.85 km
Discoverer: Cedars (Hypography: Science for everyone)
Discovery Date: 05-26-2007, 05:49 PM
Asteroid impactor diameter: 10 km
Estimated age: 65 Million years?
Extinction Level Event? (ELE)

Crater within Aleksandrovka Krater:
Boltysh Crater (GPS): 48.85 N, 32.2 E (minor crator)
Crater Diameter: 24 km
Estimated age: 65.17±0.64 million years

I like that Lambus

Is there a reason why you put the age where you did?

Just west and south there are areas of very old rock exposed. 3.1 billion years old if I remember right, somewhere between the Mississippi and Rochester MN. I was thinking that crater (if thats what it is) is very very old.

[Cedars]

Originally Posted by Turtle

Just doin' mah job!

Nice! But, uh...I see at least 2 craters there and possibly 3! Sweet holes in the ground Betty!!! I added red arrows to a Google map screen shot & attached it below.

I saw the 2nd one but thought to stick with what shows up on the satellite. The 3rd below I didnt see so I havent checked to see if theres an elevation variable there.

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[Cedars]

Originally Posted by Lambus

Affirmative, there are no recorded Terra impacts older than 2 billion years old in my entire Terra impact record. The oldest impact crater is The Vredefort Dome, the largest and oldest clearly-visible meteor impact structure.

The Vredefort Dome (GPS): -27 S, 27.49 E
Estimated age: 2023±4 million years (2 billion years)
Crater Diameter: 300 km


Eau Claire Crater (GPS): 44.45 N, 91.45 W
Crater Diameter: 97.48 x 87.85 km
Discoverer: Cedars (Hypography: Science for everyone)
Estimated age: unknown, (currently awaiting Cedars report)

Cráter del Tortuga Jorge (GPS): 27.216 N, 107.13 W (caldera?)
Diameter: 131.61 km
Discoverer: Turtle (Hypography: Science for everyone)
Estimated age: 65 Million years
(Albrecht et al. 1990; Cameron et al. 1980; Gunderson et al. 1986; McDowell and Mauger 1994)

Aleksandrovka Krater (GPS): 48.9 N, 31.8 E (major crater)
Crater Diameter: 113.47 x 94.88 km
Discoverer: Lambus (Hypography: Science for everyone)
Estimated age: 65.17±0.64 million years

Chicxulub Crater (GPS): 21.06 N, 90.2 W
Diameter: 180 km
Discoverer: Penfield (PEMEX)
Estimated age: 64.98±0.05 million years

The crater global proximity, diameter and surface erosion corresponds best to the Chicxulub event era. As a postulate I proposed that age for a possible 'Chicxulub several impacts theory'. It is highly improbable that a crater would be visible from the surface after 700 million years, due to erosion and other geologic processes.

OK that makes sense. Thanks.

Probably someone has determined that the one I posted is something else. I havent had time to really search around the net for "what isnt an impact site and why" pages.

[Turtle]

Originally Posted by Cedars

OK that makes sense. Thanks.

Probably someone has determined that the one I posted is something else. I havent had time to really search around the net for "what isnt an impact site and why" pages.

No no no! Probably, no one has seen it before at all. Stick with your gut & guns on this Cedars; write an e-mail to USGS or your favorite 'authority' figures on the topic, and ask. This phenom of regular folk finding impacts is entirely new with the advent of these freely available satellite maps, and we are pioneers in this. While you're at it with your note, ask about a list of 'other' explanations for particular circular features. If they don't have one, tell them how many fewer e-mails they have to answer if 'they' had such a list.

Lambus said...

Originally Posted by Lambus

Affirmative, there are no recorded Terra impacts older than 2 billion years old in my entire Terra impact record. The oldest impact crater is The Vredefort Dome, the largest and oldest clearly-visible meteor impact structure...

Again, finding these sites is only now blooming, and one has only to look to the Moon to know what a target Earth is. Challenge the words 'no recorded', clearly visible', and 'my entire record', as they carry a false impression of authority that is questionable.

One explanation for why older impacts may survive, is that if they were covered over by volcanism or other sedimentation before they eroded away, then at a later date those covering layers erode and the feature may re-emerge. This holds in general, and I put it forward as an explanation for the condition of the sites I found in Mexico.

No replies yet for me from 'officials' I sent the discovery info to, and now I realize that Monday is a holiday in US so I can't hope to hear back 'til Tuesday at the earliest.

PS Hey Lambus. When did you find this one? We ought possibly include the date of the discoveries in your list.

Originally Posted by Lambus

Aleksandrovka Krater (GPS): 48.9 N, 31.8 E (major crater)
Crater Diameter: 113.47 x 94.88 km
Discoverer: Lambus (Hypography: Science for everyone)
Estimated age: 65.17±0.64 million years

I see faint spokes there too, but that may be an artifact of how the images are stitched together.

Have others confirmed it from the ground?

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[Turtle]

Originally Posted by Lambus

Affirmative, the discovery date was already recorded in post#22, which also included a thumbnail to my Google Earth photo of the Aleksandrovka Krater. Discovery Date: 05-26-2007, 07:00 PM

Space rock impact site(s)

Aleksandrovka Krater (GPS): 48.9 N, 31.8 E (major crater)
Crater Diameter: 113.47 x 94.88 km
Discoverer: Lambus (Hypography: Science for everyone)
Discovery Date: 05-26-2007, 07:00 PM
Asteroid impactor diameter: >10 km
Estimated age: 65.17±0.64 million years
Extinction Level Event? (ELE)

Crater within Aleksandrovka Krater:
Boltysh Crater (GPS): 48.85 N, 32.2 E (minor crator)
Crater Diameter: 24 km
Estimated age: 65.17±0.64 million years

The Boltysh Crater (minor crator) within Aleksandrovka Krater (major crater) has been confirmed from the ground and dated, however, the Aleksandrovka Krater, has not yet been confirmed.

Roger. Did you do the ground work? Who do you report your finds to? Tell me (us?) everything you can. I loooove this stuff!

I took a screen shot of Aleksandrovka from the NASA World Wind maps and put it in the Science Gallery; click image below for enlarged view in separate window. >>>