Question

Why is the huronian supergroup rock formation particularly interesting to scientists

Answer 1

Answer;
The Huronian Supergroup is particularly exciting and interesting because, by chance, these rocks were laid down at a period when the atmosphere underwent a transition from containing no free oxygen to containing at least some free oxygen.”
 Explanation;
The Huronian Supergroup, a massive formation of rock laid down gradually between about 2.5 billion and 2.2 billion years ago, precisely the period when oxygen began to accumulate in the atmosphere. The Huronian Supergroup is 10 or 11 kilometers (six or seven miles) thick and extends well below ground 

Answer 2

They are particularly interesting because of the fact that when they came into creation, atmosphere filled with oxygen still didn't exist. They were created billions of years ago.