Monthly Archives: April 2018

Rivers 2 Stratigraphy

Explore the construction of stratigraphy through the interaction of channel geometry, lateral migration rate, subsidence rate, and avulsion frequency — interactively!

Imagine there is a river in a subsiding basin. As the river laterally migrates, it leaves behind sandy bar deposits, which are encapsulated in a matrix of floodplain muds.

The river deposits are lowered away from the basin surface by subsidence, they become part of the stratigraphic record (Figure below). Depending on the amount of lateral migration, frequency of avulsion, and subsidence rate, the degree of overlap of channel bodies in the stratigraphic deposit will vary. The movie above shows a vertical slice across the basin width, and a channel (the colorful boxes) laterally migrating across a river floodplain.

The movie comes from an educational module I am working on called Rivers2stratigraphy ( The module is open source and relies only on Python dependencies.

This material is based upon work supported by the National Science Foundation Graduate Research Fellowship under Grant No.1450681. Any opinion, findings, and conclusions or recommendations expressed in this material are those of the authors(s) and do not necessarily reflect the views of the National Science Foundation.

A LaTeX package for peer review

I recently needed to do a peer review for a co-author’s manuscript. I rarely use MS Word or LO Writer anymore except for really simple documents (e.g., a quick abstract I will have to copy and paste into a browser form anyway), and instead use LaTeX for nearly all of my writing needs. So naturally, I needed a way to do my peer review in LaTeX.

There were no packages I could find that offered the functionality I was looking for, a simple environment to place comments, numbering of comments, and a place to organize line numbers.

Enter my custom package peer_review: a LaTeX package for commenting and responding throughout the peer review process (hosted on GitHub). This package offers a few simple environments and commands that make doing a peer review pretty painless — and naturally LaTeX quality beauty!

This is a demo of the package, and the demo file is included in the repository. This demo uses a class file from my collaborator Eric Barefoot called compact_proposal (also hosted on GitHub), but the package can be used on top of the base article class too.

If others end up picking up this package, or I really get it refined I may try and release it on CTAN. But for now, it can be downloaded from GitHub as a zip or cloned with:

git clone

There are instructions for installing on the project README, and a man page with instructions on using the package, complete with examples.