Gurmeet Singh posted an Question
August 07, 2020 • 00:20 am 30 points
  • IIT JAM
  • Geology (GG)

Sir please explain only 4th point here in the picture.

(IV) Unconformity is a logical choice for a formation contact Member Tongue or lentil Bed.

1 Answer(s) Answer Now
  • 0 Likes
  • 1 Comments
  • 0 Shares
  • comment-profile-img>
    Rahul kumar Best Answer

    Member (a lithostratigraphic unit) is also known as tongue or lentil. Unconformity is a logical choice for the contact between two lithospheric unit because it represents time gap in deposition and usually marked by conglomeratic beds. As you know that lithostratigraphic units are based on lithology and beds above and below the unconformity are usually of different lithology, that's why unconformity can work as a boundary/contact between two lithospheric units.

    eduncle-logo-app

    and sir wt is this diagram about.

    eduncle-logo-app

    are these different formations in Toronto group (as an example)

    eduncle-logo-app

    Yes, the diagram is representing a stratigraphic succession divided into formations and members (tongues/lentils), by the presence of facies variation & unconformity.

    eduncle-logo-app

    and one last thing, allostratigraphy kya hai.

    eduncle-logo-app

    Allostratigraphy is the study of sedimentary strata that can be defined and identified from the discontinuities bounding them, and that can be mapped.

whatsapp-btn

Do You Want Better RANK in Your Exam?

Start Your Preparations with Eduncle’s FREE Study Material

  • Updated Syllabus, Paper Pattern & Full Exam Details
  • Sample Theory of Most Important Topic
  • Model Test Paper with Detailed Solutions
  • Last 5 Years Question Papers & Answers