Geology & Stratigraphy Bundle 4+

.Geology Timescales Tutor is an app designed to help you to memorize the relations and proper categories between Ages and Epochs, Epochs and Periods, Periods and Eras, Eras and Eons, Eons and SuperEons. It helps also to memorize at what time a certain Age, Period and Era start in terms of thousands of years, millions of years and billions of years ago.

Stratigraphy Sequence Tutor is an app to help you memorize the sequence from most recent to earliest of the Ages, Epochs, Periods, Eras, Eons & SuperEons. Additionally, there is a quiz to help you memorize how many years ago in sequence for the Ages, Epochs, Periods & Eras in named order from most recent to earliest.

As you select each timescale your correct answer will appear in the PickerRoll. You may roll through your correct answers to help you review and memorize the correct sequence of timescales and when you are ready to select the next timescale in the sequence then the PickerRoll will roll back automatically to your most recently chosen answer in the sequence and add the next correct answer to the list.

This app is an excellent study aid for students of geology, paleontology, archaeology, history & climate sciences.

Trigonometric Identities Tutor is an app available for the apple iOS app store that will help you memorize the trigonometric identities most commonly used for High School, Community College, and University mathematics classes such as precalculus and calculus courses. The app will teach you the most common Trigonometric Identities as well as those for the hyperbolic functions, inverse functions and the most common derivatives and integral values for trigonometric identities. It will help you to memorize the values of the Unit Circle for the cosine and sine functions in terms of degrees and radians. Also, it will help you to memorize and recognize the most common graphical functions for trigonometric functions, logarithms and the most common functions taught in these introductory courses. An excellent study aid for these math courses.