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The scientist finds some igneous rock which he assumes to be the same age as the sedimentary rock in which the fossil was found.

The scientist measures the ratio of parent to daughter elements in this igneous rock.

The scientist concludes the age of the igneous rock, as previously explained.

The scientist concludes the age of the fossil from the age of the igneous rock.

Link to movie: Fossil dating 6’14”

<iframe width="425" height="349" src="http://www.youtube.com/embed/K5GWSbBkjuk?hl=en&fs=1" frameborder="0" allowfullscreen></iframe>

Caption: This is a 6’14” video in which radiometric dating is explained.

Fossil tourism

South Africa has a number of fossil-rich areas which attract tourists. The Cradle of Mankind (Maropeng, Sterkfontein, Kromdraai and surrounding areas) andLangebaan are examples of places in South Africa which attract fossil tourism.

Maropeng is a Tswana word for the origin of mankind.

Living fossils

Many creatures which disappeared from the fossil record millions of geological years ago have been found to be alive still and almost identical to theirfossilized counterparts.

There are many examples of living fossils. The Tuatara, which looks like a lizard with a beak-shaped head, disappears from the record 135 milliongeological years ago, but is still alive. Lingula, a worm-like creature which disappears from the record about 400 million years ago, not very far from thebeginning of metazoan evolution, is still alive and shows no sign of significant evolution from its fossilized ancestors. This suggests that we maybe interpreting the fossil record incorrectly, and our conclusions based on it may be wrong.

Activity: fossils

1.Name / give the term for:

  • Turning to stone
  • A fossil in which the surroundings became stone, leaving a cavity where the body had been
  • The time period and era, according to the geological column, when dinosaurs first appeared
  • The time period and era, according to the geological column, when dinosaurs became extinct
  • A person who studies fossils
  • A person who studies rocks
  • Layers of deposited material
  • No members of that organism exist anymore
  • The time era, according to the geological column, when mankind evolved

2.For each of the following sentences, say whether the information is: (Circle i / ii / iii)

  • Accepted by definition if people have defined this to be so, or
  • Known by observation if people have observed this to be so, or
  • Deduced if people have come to this knowledge by reasoning.

  • During petrifaction, minerals enter, harden, and turn a body to stone.[ i / ii / iii]
  • The Triassic Period is more recent than the Permian Period. [ i / ii / iii]
  • The oldest fossils are 650 million years old. [ i / ii / iii]
  • A film fossil is a carbon mark left on rock e.g. by leaves. [ i / ii / iii]
  • The deepest rocks with reptile fossils are classed as Carboniforous. [ i / ii / iii]
  • Reptiles first evolved 350 million years ago, at the start of the Carboniforous period. [ i / ii / iii]
  • Only 2/3 of all types of organisms which have ever lived have left any fossils.[ i / ii / iii]

Questions & Answers

anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
Berger describes sociologists as concerned with
Mueller Reply
why and for what was five kingdom of classification of organisms introduced
SUBHIKSHA Reply
give the ans as fast as possible
SUBHIKSHA
Comment on the ozone depletion over the period of 1982 to 1996
Mpho Reply

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Source:  OpenStax, Siyavula: life sciences grade 10. OpenStax CNX. Apr 11, 2012 Download for free at http://cnx.org/content/col11410/1.3
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