OCR geology unit 5 2016

Original post by Pablo Picasso

It was 2 marker tho. Should've been too complication. 1 for mode of life, and 1 for one feature.

What did you write for how the enrolled trilobite moved ...
2 organisms that orodce verticle burrows (i wrote bivavles & trilobites)
What animal did you write for preserved exceptionally in the jurassic bed
2 evidence for bird evolved from dinosaurs

Ask if you couldnt answer a Q

I said it enrolled for self defence but otherwise would have "walked" with jointed appendages.

Trilobites didnt dig vertically they were only shallow infaunal, i put bivalves and gastropods

What question was that one? if you mean the solenhofen limestone it was archaeopteryx

Hollow bones in saurischians and similar hip structure, also could have said archaeopteryx was the ""missing link""

Reply 22

Original post by Vikingninja

A characteristic of calymene was that they had crescent shaped eyes set on the cheeks. This looked more like an asaphus where the eyes were on high stalks and weren't crescent shaped.

The nektonic forms have forward stalks though this was on top. Also the exoskeleton wasn't suitable as a nektonic form.

What 2 preservation for graptolites did you say
And what did you write as the answer for the two exhinoid group? Wtf, i though they were the same group

Reply 23

OP

Original post by Pablo Picasso

It was 2 marker tho. Should've been too complication. 1 for mode of life, and 1 for one feature.

What did you write for how the enrolled trilobite moved ...
2 organisms that orodce verticle burrows (i wrote bivavles & trilobites)
What animal did you write for preserved exceptionally in the jurassic bed
2 evidence for bird evolved from dinosaurs

Ask if you couldnt answer a Q

What I put in order:
Walked on appendages.
Burrowing bivalves and irregulars Echinoids.
Archaeopteryx (if you mean te solhnhon or however its spelled).
I put features of archaeopteryx (feathers and hallow bones).

Reply 24

ODES_PDES

18

Original post by Vikingninja

There's only 18 students in my year, 2 people dropped it after AS. There were 3 classes in the year above and there are 2 below. It's quite a rare subject

I gathered.
It must be offered by posh schools :tongue:

Reply 25

OP

Original post by Pablo Picasso

Eyes on stalk always a nektonic feature
Why would bethonic have eyes as light cannot penetrate 200m>

Trilobites were shallow marine. Also benthonic calymene had eyes which were advanced for organisms at the time. I put the name of a benthonic trilobite with stalks in another post here.

Reply 26

Original post by Vikingninja

Trilobites were shallow marine. Also benthonic calymene had eyes which were advanced for organisms at the time. I put the name of a benthonic trilobite with stalks in another post here.

Ikr, so nektonic is wrong then?

Reply 27

OP

Original post by Pablo Picasso

What 2 preservation for graptolites did you say
And what did you write as the answer for the two exhinoid group? Wtf, i though they were the same group

Carbonisation and replacement. Which question was the Echinoid one again, is it the one where you had to state features on the diagrams?

Original post by ODES_PDES

I gathered.
It must be offered by posh schools :tongue:

No, my school is not posh.

Reply 28

OP

Original post by Pablo Picasso

Ikr, so nektonic is wrong then?

The exoskeleton looked benthonic. Pleura weren't spaced and no inflated glabella.

Reply 29

Original post by Vikingninja

Carbonisation and replacement. Which question was the Echinoid one again, is it the one where you had to state features on the diagrams?

No, my school is not posh.

Is the one where you had to name the group of each regular and irregular echinoids

Reply 30

Original post by Vikingninja

Carbonisation and replacement. Which question was the Echinoid one again, is it the one where you had to state features on the diagrams?

No, my school is not posh.

I put replacement and pyritisation for graptolites, couldnt have been carbonisation as they have no carbon in them.. skeleton is formed from scleroprotein which is why they're preserved below the CCD

Reply 31

OP

Original post by Pablo Picasso

Is the one where you had to name the group of each regular and irregular echinoids

Can't remember that one, the one that sounds most similar to that one is with the diagrams you had to use to show their mode of life.

Reply 32

Original post by Vikingninja

Can't remember that one, the one that sounds most similar to that one is with the diagrams you had to use to show their mode of life.

yeah i cant figure out the question they're referring to either

Reply 33

Original post by savingwonderland

yeah i cant figure out the question they're referring to either

The group both echinoids belonged to. On the first page of the echinoids Q

Doesnt matter anyone, bring up another Q

Reply 34

Original post by Pablo Picasso

The group both echinoids belonged to. On the first page of the echinoids Q

Doesnt matter anyone, bring up another Q

what preservation methods did you put for graptolites

Reply 35

OP

Original post by savingwonderland

I put replacement and pyritisation for graptolites, couldnt have been carbonisation as they have no carbon in them.. skeleton is formed from scleroprotein which is why they're preserved below the CCD

I Remember in the textbook that it says graptolites can be preserved by carbonisation. We were never taught what it's exact composition was.

Original post by Pablo Picasso

The group both echinoids belonged to. On the first page of the echinoids Q

Doesnt matter anyone, bring up another Q

Yeah I can't remember that one.

With the two brachiopods did you put the mode of life for both was benthonic, epifaunal sessile?

Reply 36

Original post by savingwonderland

what preservation methods did you put for graptolites

Carbo and Pyrit, not sure if Pyrit would be acceptabke?

Reply 37

Original post by Vikingninja

I Remember in the textbook that it says graptolites can be preserved by carbonisation. We were never taught what it's exact composition was.

Yeah I can't remember that one.

With the two brachiopods did you put the mode of life for both was benthonic, epifaunal sessile?

Yep but for the first i put attached by the pedicle and the second i said free lying with spines to spread weight

Reply 38