The document discusses the K-T boundary problem, which marks the end of the Cretaceous period and the mass extinction event that wiped out the non-avian dinosaurs. The boundary is associated with the Chicxulub impact crater formed by an asteroid strike around 66 million years ago. Evidence suggests this impact triggered widespread environmental changes through effects like sulfur aerosols that blocked sunlight, causing a global climate shift and 75% of species to go extinct. Debate continues around other potential contributing factors like the Deccan Traps volcanic eruptions. The document provides details on the lithology, fossils, and occurrences of the K-T boundary in different regions including India.
Boundary problems between :-
Precambrian/Cambrian
Permian/Triassic
Cretaceous/Tertiary
Neogene/Quaternary
Stratigraphic boundaries are determined by one or more of geological events such as volcanic activity, sedimentation, tectonism, paleo-environments & evolution of life.
Faunal records have played major role in determining the boundaries of the Phanerozoic units.
The other geological events are dated on the evidence of fossil records.
Graptolites is an important index fossil for Paleozoic rocks and common throughout the world. As in Pakistan the sequences from the Ordovician to carboniferous age missing but these strata are exist in Noshehra and Chitral, so thats why its more valuable as regional fossil of sub-continent.
Boundary problems between :-
Precambrian/Cambrian
Permian/Triassic
Cretaceous/Tertiary
Neogene/Quaternary
Stratigraphic boundaries are determined by one or more of geological events such as volcanic activity, sedimentation, tectonism, paleo-environments & evolution of life.
Faunal records have played major role in determining the boundaries of the Phanerozoic units.
The other geological events are dated on the evidence of fossil records.
Graptolites is an important index fossil for Paleozoic rocks and common throughout the world. As in Pakistan the sequences from the Ordovician to carboniferous age missing but these strata are exist in Noshehra and Chitral, so thats why its more valuable as regional fossil of sub-continent.
Sedimentary basins are the depressions in the earth's crust where loose particles accumulate and finally lithified to form sedimentary rocks. Basins are particularly attractive to geoscientists from time immemorial due to the wealth hidden here in the form of oil, gas, coal etc. In this document you will find the types of basins, basin-fill types, methods of basin analysis and so on.
Microscopic animal
Microscopic Algae
Bacteria
Microfossil of uncertain effinities
Microfossil elements of smaller animal
Microfossil fragments of larger organism
Kutch is an East-west Oriented pericraton Rift basin Situated between Nagar Parkar Fault in North and Kathiawar Uplift in South.
Here we will discuss Geology and its Sequence Stratigraphy.
While the biosphere is always in flux, there have been notable instances of dramatic changes in the biosphere, the most extreme examples being five mass extinction events. In this resource, Cynthia Stokes Brown defines mass extinction, discusses that K-T extinction in detail, describes the other four major extinctions in Earth history, and ends by describing some of the proposed causes of mass extinction.
Register to explore the whole course here: https://school.bighistoryproject.com/bhplive?WT.mc_id=Slideshare12202017
Sedimentary basins are the depressions in the earth's crust where loose particles accumulate and finally lithified to form sedimentary rocks. Basins are particularly attractive to geoscientists from time immemorial due to the wealth hidden here in the form of oil, gas, coal etc. In this document you will find the types of basins, basin-fill types, methods of basin analysis and so on.
Microscopic animal
Microscopic Algae
Bacteria
Microfossil of uncertain effinities
Microfossil elements of smaller animal
Microfossil fragments of larger organism
Kutch is an East-west Oriented pericraton Rift basin Situated between Nagar Parkar Fault in North and Kathiawar Uplift in South.
Here we will discuss Geology and its Sequence Stratigraphy.
While the biosphere is always in flux, there have been notable instances of dramatic changes in the biosphere, the most extreme examples being five mass extinction events. In this resource, Cynthia Stokes Brown defines mass extinction, discusses that K-T extinction in detail, describes the other four major extinctions in Earth history, and ends by describing some of the proposed causes of mass extinction.
Register to explore the whole course here: https://school.bighistoryproject.com/bhplive?WT.mc_id=Slideshare12202017
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
How to Create Map Views in the Odoo 17 ERPCeline George
The map views are useful for providing a geographical representation of data. They allow users to visualize and analyze the data in a more intuitive manner.
3. PURPOSE OF STUDY
Of all the ‘Boundary Problem’ in the study of
Stratigraphy, the one that has attracted the largest
amount of interest and attention in recent years is
that connected with the Cretaceous-Tertiary
boundary. There was a huge change on earth after
the K-T BOUNDARY event. About 75% of life on
earth including non-avian dinosaurs, marine reptiles
like mosasaurs and plesiosaurs and ammonites
were extinct except birds.
4. INTRODUCTION
The full name of K-T Boundary is CRETACEOUS –TERTIARY Boundary.
According to the latest version of the International Stratigraphic
Scale ,the proper name for the K-T Boundary is Cretaceous –
Palaeogene Boundary (K-Pg). The term Tertiary is now
considered unofficial.
The K-T Boundary is a geological signature , usually a thin band of
rock dated on 66 million years ago. K the first letter of German
word Kreide is the traditional abbreviation for the Cretaceous
Period and T is the abbreviation for the Tertiary Period.The
boundary marks the end of the Creataceous Period , the last
period of Mesozoic Era and marks the beginning of Tertiary
Period , the first period of the Cenozoic Era as well as between
the Maastrichtiam and Danian Stages and is assoicated with the
Cretaceous- Tertiary extinction event, a mass extinction.
5. It coincides with one of the five mass extinction
in Earth’s history which affected many groups
of organisms both marine and continental ,
including all dinosaurs except for birds.
Strong evidence exists that the extinction
coincided with a large asteroid impact at the
Chicxulub Crater and the generally accepted
scientific theory is that this impact triggered
the extinction event .
6.
7. CAUSES
There are six possible causes for this mass
extinction. They are :
Alvarez impact hypothesis
Chicxulub Crater
Deccan Traps
Multiple impact event
Maastrichtian sea-level regression
Supernova hypothesis
8. ALVAREZ IMPACT HYPOTHESIS
In 1980 , a team of researchers consisting of Noble Prize
winning Physicist Luis Alvarez , his son Walter Alvarez
and his team discovered that sedimentary layers found
all over the world at the K-T Boundary contain a
concentration of Iridium near Gubbio, Italy which was
many times greater than normal. Iridium is extremely
rare in the Earth’s crust because it is a siderophile and
therefore most of it travelled with the iron as it sank into
the Earth’s core during planetary differentiation. The
Alvarez team suggested that an asteroid struck the Earth
at the time of K-T Boundary. There were other earlier
speculations on the possibility of an impact event, but
no evidence had been uncovered it at that time.
9. • The EVIDENCE for the Alvarez impact theory
is supported by chondritic asteroid and
comets which have an Iridium concentration
of 455 parts per billion much higher than the
Earth’s crust. Chromium isotopic anomalies
found in K-T Boundary sediments are similar
to that of an asteroid or comet composed of
carbonaceous chondrites .
10.
11. CHICXULUB CRATER
The Chicxulub Crater is an impact crater buried
under the Yucatan Peninsula in Mexico. Its centre
located near the town of Chicxulub, after which
the crater is named. It was formed by a large
asteroid or comet about 10-15 kilometres, the
Chicxulub impactor , striking the Earth.
The crater was discovered by Antonio Camargo and
Glen Penfield, geophysicist who had been looking
for petroleum in the Yucatan Peninsula during the
late 1970, this crater is oval with an average
diameter of 180 kilometres, about the size
calculated by Alvarez team.
12. A mass extinction in which 75% of plant and animal species
on Earth suddenly became extinct, including all non
avian dinosaurs.
EVIDENCE for the impact origin of the crater included
shocked quartz, a gravity anomaly and tektites in
surrounding areas.
The asteroid landed in a bed of anhydrite (CaSO4) and
gypsum[CaSO4.2(H2O)] which would have ejected large
quantities of sulphur trioxide SO3 they combine with
water to produce a sulphuric acid aerosol. This would
have further reduced the sunlight reaching the Earth’s
surface and then over several days, precipitated planet
wide as acid rain, killing vegetation, plankton and
organisms which build shells from calcium carbonate.
13.
14. DECCAN TRAPS
Before 2000, arguments that the Deccan Traps flood basalts
caused the extinction thorugh several mechanisms,
including the release of dust and sulphuric aerosols into the
air which might have blocked sunlight and thereby reduced
photosynthesis in plants. In addition , Deccan Trap
volcanism might have resulted in carbon dioxide emissions
which would have increased the Greenhouse Effect when
the dust and aerosols cleared from the atmosphere.
However even Walter Alvarez acknowledge that there were
other major changes on Earth even before the impact such
as drop in sea level and massive volcanic eruptions that
produced the Indian Deccan Traps and these may hve
contributed to the extinctions.
15. EXTINCTION OF DINOSAURS
During their heyday in the Triassic, Jurassic and
Cretaceous periods dinosaurs evolved to fill
niches in most ecosystems. Mass extinction
often come to mind when the term extinction
is mentioned but the normal background
extinctions that occur throughout geologic
time probably account most for biodiversity, it
is rare to any particular type of dinosaur
survived from one geologic formation into the
next.
21. K-T BOUNDARY IN INDIA
There are three regions in Indian subcontinent which have
exposed “Passage Beds”(Rama Rao, 1956). They are the Sind
area in Pakistan , the Tiruchchirappalli area in south India and
the Assam region in the north-eastern India.
The geology of the Sind area was first discribed by Blanford
(1880) which was later improved by Vredenberg (1909). The
basic divisions of the stratigraphic units representing the
Cretaceous Tertiary transition.
The Upper Cretaceous rocks of the Tiruchchirappalli area have
been classified into Uttatur , Trichinapoly and Ariyalur
formations.
The Upper Cretaceous rocks of Assam region comprising the
Mahadek Formation is conformably overlain by a marine
succession known as Langpar Formation.
22. PROBLEMS
Of all the ‘Boundary Problem’ in the study of Stratigraphy, the
one that has attracted the largest amount of interest and
attention in recent years is that connected with the
Cretaceous-Tertiary boundary. Several important
contributions dealing with this subject has been made in and
outside India; and this paper is to give a critical review of
these studies and discuss some aspects of fundamental
interest in the further elucidation of this problem.
Our starting point in this study is the old view prevalent for quite
a long time that between the Danian which represents the
youngest subdivision of the Cretaceous, and the Palaeocene
which constitutes the oldest part of the Tertiary, there is a
distinct break in the European Stratigraphical Scale , and this
break must be considered as making the Cretaceous-Tertiary
Boundary.
23. It is however important to note that even in the early days
when this conclusion was put forward in Europe, there
were some doubts as to the exact ‘definition’ of the
‘Danian’ and its placement in the Cretaceous –Tertiary
succession (Rama Rao 1953). The views of the earlier
geologist in this matter were based mostly on field
observations, together with the evidence of some
macrofossils like Molluscs. Now a days the problem has
been looked at from all possible points of view- structural,
straitgraphical, and palaeontological; of these
micropalaeontological studies have come to play an
increasingly part, and it is currently believed by many
stratigrapher that the attack from this side is the most
effective and reliable way of dealing with this problem.
24. REFERENCES
BOOK
Ravindra Kumar- Fundamentals of Historical
Geology and Stratigraphy of India.(Page no.
201-203)
WEBSITE
https://www.britannica.com
https://en.m.wikipedia.org
https://www.sciencetheearth.com