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#26

Mick Cov
Member
Joined: 20 November 2016
Posts: 148
Member
16 July 2018 04:52 pm

Hunting the yellow wrote:

https://www.prospectingaustralia.com.au … -_copy.jpg

starfish not well developed/formed I find better ones in certain beds.

It goes to show that if you split the rock in the right place you find the fossil...
A couple of mm either side of it and you miss it!

1 user likes this post: Hunting the yellow

#27

goldierocks
Member
Joined: 10 January 2015
Posts: 966
Member
16 July 2018 08:52 pm

Mick Cov wrote:
Hunting the yellow wrote:

https://www.prospectingaustralia.com.au … -_copy.jpg

starfish not well developed/formed I find better ones in certain beds.

It goes to show that if you split the rock in the right place you find the fossil...
A couple of mm either side of it and you miss it!

Fortunately that is usually because fossils lie on bedding planes (old sea or lake floors that they settled on), and many rocks split most easily along those planes


Robert Benchley...
I have kleptomania, but when it gets bad, I take something for it.

1 user likes this post: Mick Cov

#28

Hunting the yellow
Member
From: down a hole
Joined: 20 December 2012
Posts: 1,716
Member
17 July 2018 02:47 am

goldierocks wrote:

I'm no expert, but I would not have thought that slate would be the right rock to explore for trilobites

sometimes yes in victoria but mostly found in siltstone or mudstone witch is a crumbly type of rock and subjected to cracking in the heat and cold.

Last edited by Hunting the yellow (17 July 2018 02:48 am)


born 150 years too late and missed all the gold rushers

#29

Hunting the yellow
Member
From: down a hole
Joined: 20 December 2012
Posts: 1,716
Member
17 July 2018 02:48 am

Mick Cov wrote:
Hunting the yellow wrote:

https://www.prospectingaustralia.com.au … -_copy.jpg

starfish not well developed/formed I find better ones in certain beds.

It goes to show that if you split the rock in the right place you find the fossil...
A couple of mm either side of it and you miss it!

quite right there


born 150 years too late and missed all the gold rushers

#30

Hunting the yellow
Member
From: down a hole
Joined: 20 December 2012
Posts: 1,716
Member
17 July 2018 02:50 am

goldierocks wrote:
Mick Cov wrote:
Hunting the yellow wrote:

https://www.prospectingaustralia.com.au … -_copy.jpg

starfish not well developed/formed I find better ones in certain beds.

It goes to show that if you split the rock in the right place you find the fossil...
A couple of mm either side of it and you miss it!

Fortunately that is usually because fossils lie on bedding planes (old sea or lake floors that they settled on), and many rocks split most easily along those planes

cleavage planes of the strata yes.


born 150 years too late and missed all the gold rushers

#31

goldierocks
Member
Joined: 10 January 2015
Posts: 966
Member
17 July 2018 10:39 am

Hunting the yellow wrote:
goldierocks wrote:
Mick Cov wrote:
Hunting the yellow wrote:

https://www.prospectingaustralia.com.au … -_copy.jpg

starfish not well developed/formed I find better ones in certain beds.

It goes to show that if you split the rock in the right place you find the fossil...
A couple of mm either side of it and you miss it!

Fortunately that is usually because fossils lie on bedding planes (old sea or lake floors that they settled on), and many rocks split most easily along those planes

cleavage planes of the strata yes.

Cleavage and bedding are different things - cleavage forms during later folding. Unfortunately cleavage is often not parallel to bedding, so you need to find where they are parallel. Cleavage is best developed in slates, and in Victoria the folding is so tight that one can find plenty of places where cleavage and bedding are parallel. Cleavage is usually far weaker in coarser grained sedimentary rocks such as siltstones and sandstones, and they more often break along the bedding.


Robert Benchley...
I have kleptomania, but when it gets bad, I take something for it.


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