What does the geologic chronology symbol o,s,d,c,d,o,e, mean

This question is about the terminology of geology. These letters are used to describe the geologic age of the Earth over different time periods. The details are as follows:

o'It is represented by the Oxygen Period, the upper limit of the Cambrian period, a period marked by the first appearance of arthropods on the seafloor.

s'Represented is the Silurian period, a period marked by the first appearance of plants on the ocean floor, and in the millions of years that followed, these plants began to form the first forests.

d'There are two possibilities, one is representative of the Devonian period, a period when fish began to appear in large numbers in the ocean; The second represents the Permian-Triassic extinction event, which was an important extinction event in the history of the earth.

c'It is represented by the Carboniferous period, when coal forests began to form.

k'Represented is the Cretaceous period, which is the famous period of dinosaurs that lasted until the beginning of the Jurassic period.

t'Represented is the Triassic, the beginning of which marked the end of the Permian-Triassic extinction event.

j'Represented is the Jurassic, which was the heyday of dinosaurs.

p'Represents the Cretaceous-Tertiary extinction event, which wiped out all non-avian dinosaurs.

r'It represents the Anthropocene, a period when humans began to have a significant impact on the planet.

Please note that these are only general descriptions, and that each geological period has its own specific biome evolution and environmental changes.

o is for Ordovician.

S Silurian system. d Devonian.

c Carboniferous. Inferior tertiary lineage.

Indicates the subdivision of the era under which the capital letters represent.

For example, in Q1, Q represents the Quaternary Period, about 2 million years ago. The Quaternary is divided into q1, q2, q3, and q4, which represent different periods of the year. For example, Q3 represents the Pleistocene epoch in the Quaternary Period, and Q4 represents the Holocene.

Superscript in Quaternary Q:

EL Sediments, PD Soils, COL Colluviums, DIS Sediments, DP Slips, SL Soil Flow Deposits

DL Slope Deposits, PL Flood Deposits, Al Alluviums, DF Debris Flow Deposits, CAD Cave Debris Deposits, CA Cave Chemical Deposits,

CAL Underground River Sediments, CALL Underground Lake Sediments, CAS Quanhua, L Lake Deposits, FL Marsh Deposits, GL Glacier Deposits,

GFL ice-water deposits, LGL glacial lake deposits, FD freeze-thaw deposits, EOL aeolian deposits, LS loess, EDL remnant slope deposits

DPL Slope Alluvium, Dal Slope Alluvium, PAL Flood Alluvium, APL Alluvial Deposit, ALL Alluvial Deposit, MEM Estuarine Deposit,

MLA Lagoon Sediments, MFL Coastal Marsh Deposits, MCM Coastal Sediments, MR Coastal Biological Deposits,

MS shallow marine sediments, MD deep-sea sediments, PR deposits of unknown origin, VL volcanic deposits, H artificial deposits.

In order to facilitate the exchange of geologists in the world, facilitate research, and make it simple to represent in geological maps, geological chronology symbols are usually represented by capital letters. The number in its subscript generally represents the epoch in the period, such as k, which refers to the Cretaceous of the Mesozoic Era, and the subscript 1 refers to the Early Cretaceous; Another example is o, the Early Paleozoic Ordovician, and the subscript 2 refers to the Middle Ordovician. The superscript is a further subdivision of it, that is, the division of the same world.

And so on.

It refers to the subdivision of the era in the era of the preceding capital letters.

For example, in Q4 and Q3, Q represents the Quaternary Period, about 2 million years ago, and in these 2 million years, it is also Q1 Q2 Q3 Q4, such as Q3 represents the Pleistocene in the Quaternary, and Q4 represents the Holocene in the Quaternary.

The superscript indicates the segment, the superscript 1 indicates the lower segment, 2 indicates the middle segment, and 3 indicates the upper segment.

The formula refers to the cell Ling round grid, there are "relative references" and "absolute references" The function of the dollar sign "$" in the excel formula is to lock the row number or column label when "absolute reference" (the cell address is composed of column label + row number ruler, such as a1, a is the column mark, 1 is the line number), "which one is locked in front of it: "a1" style is "relative envy argument".

C - chlorine bleaching (Cl2).

e——Alkali extraction.

h——Hypochlorite bleaching.

d——Chlorine dioxide bleaching.

z - ozone bleaching.

o - Oxygen delignification.

p - hydrogen peroxide drifting acres.

q - Chelation treatment.

d c – chlorine dioxide bleaching containing chlorine gas.

EO – Oxygen-enhanced alkaline extraction.

EP - Hydrogen peroxide-enhanced alkali pumping is a vertical attack on Senti.

D1 and D2 are the first and second stages of chlorine oxide bleaching.

O-level employees refer to senior employees such as CEOs and CTOs, and then the president level and the R-level of the board of directors are the top level of the company, and the others are middle-level and below.

the higher the level , the better the salary !

According to the inscription, the above symbols represent: Ordovician, Carboniferous, Mud-core Pot, and Sanqiao Chong-Stack.

The Quaternary period of the earth was changed to the Kai layer.

d in cd d c: is to switch directly to that folder.

dir s b.

b Only the file name and extension will be displayed.

s displays files in the specified directory and all subdirectories.

Format of the dir command:

dir [d:][path][name][[/a][:attrib]][/o:[sorted][/s][/b][/l][/c[h]

1) dir a: attrib contains all files (system files) by default. Implied files).

attrib[:]h -h] shows only hidden or non-hidden files.

r -r] to show only read-only files or non-read-only files.

s -s] shows only system files or non-system files.

a -a] displays only files to be archived or non-archived files.

2) o[:]sorted: By default, the subdirectories are displayed in full alphabetical order, before the file.

o[n -n]: Displays in reverse alphabetical order or in file name order.

e-e]: Displays in reverse alphabetical order by extension.

d -d]: Displays in reverse chronological order.

s -s]: Displays by size from largest to smallest or in reverse.

g -g]: By subdirectory before file or file before subdirectory.

3) s parameter: lists all files in the current directory and its subdirectories.

Listing: Dir S a o:n C: > PRN

Print out all subdirectories and files on the C drive by affiliation and alphabetical order according to the subdirectories and files.

4) b Parameter: Only the file name and extension will be displayed.

5) l Parameters: List all files or subdirectories with lowercase letters.

Training: dir a column for all files (including hidden and system files) in the current directory

The dir ah column contains the subdirectories (implied) dir a-h

dir as column system file dir a-s

dir ad column subdirectory dir a-d

dir o in alphabetical order.

dir b only shows the file name and extension.

1) d=60°, b=60° (circumferential angle theorem), and ab=6,bc=3,ab is the diameter of o, acb=90°,oe ac,oe bc, and the point o is the midpoint of ab, oe is the median of abc, oe=1

bc=32) to connect OC, <>

Then it is easy to obtain coe afe, so the area of the shaded part = the area of the sector foc, the s sector foc

The area of the shaded part is 3

According to the title, each letter represents a two-digit password, that is, the position of the letter, the first number refers to the number of rows, and the second number refers to the number of columns, so the password 12-35-54 represents the word as: box;

The password compiled from the word seven is: 44-15-52-15-34 so the answer is: box, 44-15-52-15-34

The password 12-35-54 stands for the word box

The password compiled by the word seven is: 44 15 52 15 34

a-11,b-12,c-13,d-14,e-15f-21,g-22,h-23,i-24,j-25k-31,l-32,m-33,n-34,o-35p-41,q-42,r-43,s-44,t-45u-51,v-52,w-53,x-54,y-55z-61

Password 12-35-54 is a single order.

WordsboxThe password compiled by the word seven is: