# DeepTime for Geology

> Interactive geological time scale with detailed unit information and GSSP map. (iPhone/iPad app by Hunt Mountain Software.)

- Source: https://appshunter.io/ios/app/deeptime-for-geology/id1500200416 (this page in markdown: same URL + `.md`)
- Developer: [Hunt Mountain Software](https://appshunter.io/developer/328710008)
- Category: Education, Reference
- Price: Free
- Rating: 5.00/5 from 7 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 26.0 · 1 MB
- Languages: American English
- Released: 2020-03-20
- Data updated: 2026-08-19
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/deeptime-for-geology/id1500200416/reviews.md

## What is DeepTime for Geology?

DeepTime puts geological time at your fingertips. DeepTime is a full interactive version of the latest geological time scale: tap on any time unit to see more detail about it, including how its GSSP (golden spike) is defined. It even has the CMYK and RGB color codes for every time unit, great for when you need to have the right color for a map or chart. Even more, it is completely searchable by name or age. Come across an unfamiliar time term in an older paper? Search for it, and you'll see how it relates to the modern time scale. 

What's more is that all the GSSPs (the golden spikes) are shown on a gorgeous geological map of the world (courtesy of macrostrat.org), which shows their context in stunning detail. Tips for using time terms are also included with simple examples. Whether you are a geologist, a student, a science writer, or just a fan of Earth history, DeepTime will become your go-to resource for understanding geological time.

## Key features

- Interactive geological time scale
- Detailed GSSP definitions
- CMYK and RGB color codes
- Searchable by name or age
- Global GSSP map integration
- Tips for using time terms

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/deeptime-for-geology/id1500200416/reviews.md

### 5/5 — Antropocene

*2025-03-22*

So I love this but can you please add the new period antropocene. It started in 1950 ce and also please mark important things on the TimeScale. Like asteroid impacts e.g vredefort, Sudbury. Please

### 5/5 — Superb

*2024-10-13*

This app is just perfect. The amount of information and quality of the data is just incredible. A must for anyone with any interest in geological time.

### 3/5 — Not bad

*2023-07-12*

This app isn’t bad for the timescale part, but the map says nothing about the bed rock. There are better apps out there

**Developer response:** Sorry that the map wasn't useful for you; the primary purpose of this app is for the current time scale and formerly used time units. If you're looking for a full-featured geologic map app, check out Mancos, Rock'd, or Flyover Country.

### 5/5 — Modern app for the timescale

*2020-05-24, version 1.1*

Finally someone made a timescale app that works with modern iPhones and iOS! Hope it stays updated and continues to be developed.

## Frequently asked questions about DeepTime for Geology

### What is DeepTime for Geology?

DeepTime for Geology is a free educational app that provides an interactive geological time scale. It offers detailed information on each time unit, including GSSP definitions and color codes, and allows users to search for geological terms.

### Is DeepTime for Geology free to use?

Yes, DeepTime for Geology is completely free to download and use. It does not feature any in-app purchases or advertisements.

### What devices does DeepTime for Geology support?

DeepTime for Geology is available for iPhone, iPad, and iPod touch devices. It is designed for iOS users interested in geology.

### How often is DeepTime for Geology updated?

The latest version of DeepTime for Geology is 1.13, last updated on January 12, 2025. This indicates regular maintenance and potential feature additions.

### Can I find information on GSSPs in DeepTime for Geology?

Yes, DeepTime for Geology provides detailed information on GSSPs (golden spikes) for each geological time unit. These are also visualized on a global geological map.

### Is DeepTime for Geology suitable for beginners?

The app includes tips for using time terms with simple examples, making it accessible for students and enthusiasts who may be new to geological time scales.

### What is the age rating for DeepTime for Geology?

DeepTime for Geology has an age rating of 4+, making it suitable for a wide range of users, including younger learners interested in science.

### Does DeepTime for Geology have ads?

No, DeepTime for Geology does not contain advertisements. It is a completely ad-free experience for users.

## Version history (last 5 releases)

### 1.14 — 2026-07-08

* Updated with the latest changes to the international geologic time scale, particularly the updates to several stage boundaries in the Permian and Triassic.
* Bug fixes.

### 1.13 — 2025-01-12

Updated with the latest changes to the international geologic time scale:

• Numerous revisions to numerical time scale, including 58 updates to stage boundaries, 22 updates to epoch boundaries, and 7 updates to period boundaries.

• Includes the newly ratified GSSP (golden spike) at the base of the Valanginian Stage of the Cretaceous.

### 1.12 — 2023-10-27

Updated for iOS 17
Includes the most recent ages for the geologic time scale
Now includes North American Devonian stages and series

### 1.11 — 2023-07-15

Updated with the latest changes to the international geologic time scale:

• Includes the newly ratified GSSP (golden spike) at the base of the Langhian Stage of the Miocene.

• Includes the new age for the Burdigalian / Langhian stage boundary

• Added several informal units plus the order of North American stages and series for the Ordovician, Silurian, Mississippian, and Pennsylvanian

### 1.10 — 2023-04-08

Updated with the latest changes to the international geologic time scale:

• Includes the newly ratified GSSP (golden spike) at the base of the Barremian Stage of the Cretaceous.

• Includes the new age for the Hauterivian / Barremian stage boundary

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All apps by Hunt Mountain Software: https://appshunter.io/developer/328710008

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-19.*