| Circular lakes | arcylon | 7/5/05 12:44 PM | Does anybody know what these circular lakes and depresions are? Maybe some kind of volcanic feature like maars? |
| Re: Circular lakes | Kempster | 7/5/05 12:53 PM | I would guess by meteors. I know this lake (view attachment) was created by a meteor. Duplicate placemark removed. You can find the original post HERE. Please remember to enable your BBS Layer in Google Earth and to STF - Search The Forum. _______ |
| Re: Circular lakes | lodi | 7/5/05 3:44 PM | This is neither a volcanicnor a extraterrestric but a permafrost feature. . Information eg at http://www.ingentaconnect.com/content/nrc/cjes/2002/00000039/00000008/art00007. Hope that helps |
| Re: Circular lakes | Hill (GEC moderator) | 7/5/05 4:01 PM | Take a look at this recent post and linked story. Then take a look at this post which I recently made. The two look similar, but may or may not have different causes. And hey....welcome to the forums. _________________________ Click the images to vi |
| Re: Circular lakes | arcylon | 7/6/05 4:48 AM | Hi everyone, thanks for your help, I've found out that these features are known as Thermokarst Lakes, they are indeed a permafrost feature. Cheers! |
| Re: Circular lakes | jeremy502 | 7/6/05 5:55 AM | if you look closely, youll see more little "lakes" that arent filled with water, they dont look like craters, just little sunken bits._________________________ ~jeremy |
| Re: Circular lakes | DavidRayL | 8/22/05 10:47 AM | Dude, I dont think a Meteor would be able to do that. its in the canadian shield, if a meteor hit it hard enough to cause a circumference like that... it be WAY deeper than it is... this lake is more like a ring not a huge hole. |
| Re: Circular lakes | DavidRayL | 8/22/05 10:52 AM | Nice! Me and my dad were tryin to figure it out. thanks, |
| Re: Circular lakes | Furry_Phil | 8/23/05 2:46 PM | Manicougan is indeed an impact structure. It is about 240 million years old and the reason for the ring shape is explained here. You might also like to try my Impact Crater Tour here._________________________ "When you're climbing the ladder of succe |
| Re: Circular lakes | DavidRayL | 9/2/05 12:58 AM | Wow. Thats jsut crazy! I really didnt thin kthat it could have been an impact site... Sooo.. are they saying that because of the shield being completely rock and the pressure underneath, the melted rock actually got pushed back to level with the surf |
| Re: Circular lakes | Sojourner | 9/2/05 1:07 AM | Welcome and yes Kemptser got it in one. They are indeed thermocast lakes caused by permafrost and we even have them down here in Australia which indicates that the climatic conditions we have known in our lifetime are not how it has always be. Intere |
| Re: Circular lakes | Hill (GEC moderator) | 9/2/05 9:08 AM | Are the Austrailian lakes in this post the ones you are talking about? |
| Re: Circular lakes | ElisaDay | 9/2/05 11:08 AM | I recognized them too, but I've never seen them so big! They're usually called "pingos" and there are several types, and there are "palsas" too. In the Netherlands we've got them too, from the last ice age, though they're tiny compared to these. |
| Re: Circular lakes . . as a geological structure | __Master_ | 9/4/05 11:01 AM | Hi, i'm spanish and I apologice, first at all, about my inglish, so ... This circular lakes are just a common geological structure, (called "dolinas" in spanish ) it happend wher we have a soft layer of sand and a hard layer under it. The hard layer |
| Re: Circular lakes . . as a geological structure | MrFocal | 10/4/05 7:27 PM | That is a great explanation (the english notwithstanding) and for that we thank you. Did your explanation contain a reason for why the result is circular, not square, not oval? Were these once eruption areas (hot springs)? |
| Re: Circular lakes . . as a geological structure | geogmajorbrum | 10/5/05 9:47 PM | Thermokarst features are rounded because the initial formation of the feature begins at a point rather than the whole feature being created at once. The thermokarst features in question were most likely formed by ice wedges in the permafrost. In the |
| This is a Terrestrial Impact Crater | 5457171 | 10/24/05 7:22 PM | Manicouagan, Quebec, Canada The Manicouagan impact structure is one of the largest impact craters still preserved on the surface of the Earth. The prominent 70 kilometers (43 miles) diameter, ice-covered annular lake that fills a ring where impact-br |
| Re: Circular lakes | arcticornithophile | 7/10/07 9:35 AM | More on those lakes - my suggestion is that they are kettle lakes. Why circular? Imagine post-ice-retreat big blocks of ice left on flat ground - as they slowly melt they are subject to wind from all directions - and they have some drainage that car |
| Re: Circular lakes | ElCangri | 9/17/07 5:42 PM | here is a good explanation: http://ougseurope.org/rockon/surface/thermokarst.asp nice find!!!_________________________ never take a laxative and a sleeping tablet at the same time |
| Re: Circular lakes | Tomatriox | 7/15/08 7:27 AM | It's a meteor crater. I'm from Quebec and I know some association that tries to conserve this monument. I'ts probably one of the oldest crater in the world. http://www.soslevasseur.org |
| Re: Circular lakes | arcticornithophile | 2/18/11 6:15 PM | These are kettle lakes |