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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Fri Jul 23, 2010 11:17 pm 
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There are several processes that plants and animals or their parts can be preserved. No matter which way preservation occurs it takes a lot of luck, pure happenstance.

How are fossils formed?

* Freezing (refrigeration)
* Drying (desiccation)- Mummified
* Sedimentation
* Asphalt
* Amber
* Carbonization (distillation)
* Permineralization

http://www.fossils-facts-and-finds.com/ ... ormed.html" onclick="window.open(this.href);return false;

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Sun Jul 25, 2010 3:17 am 
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I realise there are are various processes that lead to fossil formation. However, I am looking at the traditional fossils that are found in rocks, especially reptiles and plants.
Briefly explain the process that happens to create the fossil record in the rock.

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Sun Jul 25, 2010 3:37 am 
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The most common process of fossilization is known as permineralization or mineralization. During this process the organism is replaced by minerals in the liquid in the soil in which the body is immersed.
First, it is essential that by being covered in soil, mud or sand, the body of the dead organism should immediately be protected from contact with the air. Over the following months, new layers of sediments are laid down and act as a thickening shield, protecting the animal's body from external agents and physical wear. Within a few hundred years the animal's remains lie several meters beneath the surface of the land or sea or lake bottom.
As time passes, structures such as the animal's bones, shell, scales or cartilage slowly begin their chemical breakdown. Underground waters begin to infiltrate these structures, and the dissolved minerals contained in these waters (such as calcite, pyrite, silica and iron), gradually replace the chemicals in the tissues. Thus over the course of millions of years, these minerals give rise to an exact stone copy by replacing the tissues in the organism's body. Finally, the fossil comes to possess the exact shape and external form as the original organism, although now converted into stone.


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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Sun Jul 25, 2010 5:21 am 
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Spot on, Toko. Exactly what I was looking for. :clap: :clap: IT. :thumbs_up:

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Sun Jul 25, 2010 8:18 am 
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:dance: Thanks OWN. That was a nice one :thumbs_up:


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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Sun Jul 25, 2010 2:11 pm 
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Please guess the geological trip throuh 6 Kruger Geozones
Your trip starts in a camp, situated in thornveld on Gabbro. Gabbro is a coarse grained igneous or volcanic rock with composition similar to basalt. The Gabbro intrusion is characterized by a thorn savanna with a dense grass cover. The scattered trees and wide-open plains covered by sweet grass attract many browsers that forage round the stony area.
You leave this area and enter an area of Bushwillow Woodlands where the geological substrata are Granite and Gneiss. There are a lot of Acacia nigrescens. You stop for a look out on a get out point and sit on a beautiful bench overlooking the woodland.
Here is again a geological change, you enter an area of Gabbro.
You cross an untarred road and you come to the geological formation called Ecca-shales. The terrain is called Acacia welwitschii Thickets on Karoo Sediments. It is low lying and reasonably flat. It extends as a narrow strip from Crocodile Bridge northwards. The thickets are seldom broader than four kilometres. The landscape is unique considering that the vegetation is dominated by Acacia welwitschii subsp. Delagoensis. This landscape carries what is possibly the largest biomass of game in the KNP. You continue and drive along that tourist route to a dam which is at an elevation around 20 metres lower than the surrounding bush.
Further east you reach one of the best game viewing areas in Kruger, the Sclerocarya caffra and Acacia nigrescens Savanna on Basalt. This landscape extends from the Crocodile River to just north of Satara with the Lebombo Mountains as the eastern and the Karoo sediments as the western boundary. It is one of the largest landscapes and occupies 7.2 percent of the KNP. Before you enjoy the open tree savanna you stop for a meal in a camp restaurant. Then you drive in southern direction, cross a river and you turn left. You are on a tar road and reach two watering holes.
There are lots of animals to be seen on the drive up to a Picnic Spot. It is a beautiful place overlooking a river where a largish pool has formed. There is a bird hide on the river, about 5 km from the picnic site to the east, there is the Lebombo Mountain Bushveld on Rhyolite soils. The Lebombo Mountains are situated almost 100 metres higher than the adjacent basalt plains.


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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Sun Jul 25, 2010 9:09 pm 
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onewithnature wrote:
Easy one: How are fossils formed?



onewithnature wrote:
I realise there are are various processes that lead to fossil formation. However, I am looking at the traditional fossils that are found in rocks, especially reptiles and plants.



You changed your Q. ??? Perhaps you should make it clear from the start what you are looking for? :huh:

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Sun Jul 25, 2010 9:18 pm 
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Pretoriuskop

To

Skukuza

To

Lower Sabie

To

Tshokwane

To

Satara

To

N'wanetsi and the N'wanetsi hide

[Ecca shales extends as a narrow strip from Crocodile Bridge northwards to the vicinity of the Timbavati picnic area. The thickets are seldom broader than four kilometres].

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Sun Jul 25, 2010 9:27 pm 
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Elzet wrote:

Satara

To

N'wanetsi and the N'wanetsi hide.
:thumbs_up:

The rest is wrong :wink:


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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Mon Jul 26, 2010 2:12 am 
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Nice Q, Toko. :thumbs_up:

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Mon Jul 26, 2010 2:31 am 
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Elzet wrote:
onewithnature wrote:
Easy one: How are fossils formed?



onewithnature wrote:
I realise there are are various processes that lead to fossil formation. However, I am looking at the traditional fossils that are found in rocks, especially reptiles and plants.



You changed your Q. ??? Perhaps you should make it clear from the start what you are looking for? :huh:


No, just clarified it in the tradition of a great "crypticologist". :lol: :lol:

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Wed Jul 28, 2010 6:02 am 
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onewithnature wrote:
Elzet wrote:
onewithnature wrote:
Easy one: How are fossils formed?



onewithnature wrote:
I realise there are are various processes that lead to fossil formation. However, I am looking at the traditional fossils that are found in rocks, especially reptiles and plants.



You changed your Q. ??? Perhaps you should make it clear from the start what you are looking for? :huh:


No, just clarified it in the tradition of a great "crypticologist". :lol: :lol:


Changing your Q after I gave you the A is not cryptic, it lacks the spirit of the game.

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Thu Jul 29, 2010 1:06 am 
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Sometimes the spirit of the game is in moving the goalposts slightly, as clarification leads to more accurate answers and enhanced learning. Actually, there is at least one person that you know very well that does that on a regular basis - never heard you complain there before! :hmz: :hmz:

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Thu Jul 29, 2010 2:25 am 
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:?

Let's move on ...

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 Post subject: Re: Geology Quiz (RV)
Unread postPosted: Thu Jul 29, 2010 2:28 am 
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I agree ... who to post?

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