Difference between dated to and dated as

dated at is correct
i have never seen dated to in correct usage
also i feel that evaluating a sentence in a holistic way is much better option than to rule out only on the basis of idiom usage

You are right, but in case the entire clause is same apart from the dated to or dated at usage, then we have to choose the correct option on idiom usage only
Thanks for the response

Remnants of a meteorite that exploded in Siberian sky and scattered over 400 square km in and around lake baikal has been dated to be 1.23 Billion years old and thus is evidence of the earliest known Meteor impact on earth.

A. has been dated to be 1.23 Billion years old and thus is
B. has been dated at 1.23 Billion years old and thus
C. have been dated to be 1.23 Billion years old and thus are
D. have been dated as being 1.23 Billion years old and thus
E. have been dated at 1.23 Billion years old and thus are

" Dated at" is not an English Idiom.
"dated to be" is functioning as synonymn with "estimated," which takes "to be" in its proper idiomatic construction.


date back (to someone or some time)-----

to have origins that extend back to the time of someone or something.
This part of the palace dates back to Catherine the Great. This is old! It really must date back.

at an early date-------

soon; some day soon.
The note said, "Please call me at an early date." You are expected to return the form to the office at an early date.
See also: early

Hi Moumi,

I did a similar question, but the correct answer was the one with "dated at" idiom in the sentence.

Also, i think that the correct answer to the SC that you has posted is C (if i consider dated to be correct), but if i consider dated at as correct, then answer should be E. What is the OA?

Thanks

I think the IMOQA should be E

The source of the question “Remnants of a meteorite” cited by Moumi2013 is unknown.
I searched and found this thread: https://www.manhattangmat.com/forums/arc ... -t612.html. The answer provided in that thread is E.

Let’s resort to official problems in order to unearth official idioms concerning chronology.

1) (TO BE) ESTIMATED TO BE X YEARS OLD

OG13, N 30: “Paleontologists believe that fragments of a primate jawbone unearthed in Burma and estimated to be 40 to 44 million years old provide evidence of a crucial step along the evolutionary path that led to human beings”

2) (TO BE) DATED AT X YEARS OLD

OG13, N 81: “Fossils of the arm of a sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on the Greater Antilles islands.”

OG13, N 140: “Rock samples taken from the remains of an asteroid about twice the size of the 6-mile-wide asteroid that eradicated the dinosaurs have been dated at 3.47 billion years old and thus are evidence of the earliest known asteroid impact on Earth.” (*in this problem the incorrect “dated to be” is the only reason for eliminating answer choice C)

So far, these are the only problems on the idioms about chronology I was able to find.

However, I believe that the following might also be correct:

(TO BE) DATED TO [a year/certain time]
The beginning of the grammar decline is often dated to 1967, with the publication of “The Plowden Report,” a government report on primary education. (https://www.newsweek.com/infinitive-and-beyond-250767)

TO DATE (BACK) TO [a year/certain time]
His drug arrests dated to 2001, when undercover police officers reported that he sold crack cocaine to them. But charges in that case were dropped. (https://www.postandcourier.com/article/2 ... /140519820)

TO DATE FROM [a certain time] – the item was created at that particular time and still exists
The church dates from the 13th century. (Longman Dictionary)

In addition, you might find the following threads useful:
https://www.manhattangmat.com/forums/dat ... -t604.html
https://www.beatthegmat.com/help-underst ... 84293.html