calendar corrections

1 files changed, 4 insertions, 4 deletions

diff --git a/CosmicCalendar.hs b/CosmicCalendar.hs
index 5f5f3b3..cdc5893 100644
--- a/CosmicCalendar.hs
+++ b/CosmicCalendar.hs
@@ -149,7 +149,7 @@ theCalendarList =
     earthDescription
     "https://en.wikipedia.org/wiki/History_of_Earth#Solar_System_formation",
 
-    CalendarEntry (3.4 & millionYearsAgo) Nothing
+    CalendarEntry (2.6 & millionYearsAgo) Nothing
     "First Stone Tools"
     "Mode I: The Oldowan Industry"
     [text|
@@ -465,7 +465,7 @@ Named Nyasasaurus parringtoni, the roughly 243-million-year-old fossils represen
     "",
 
     CalendarEntry (445 & millionYearsAgo) Nothing
-    "The Ordovician Extinction"
+    "The first mass extinction"
     "Fluctuating sea levels cause mass die-off of marine invertebrates"
     [text|
     The earliest known mass extinction, the Ordovician Extinction, took place at a time when most of the life on Earth lived in its seas. Its major casualties were marine invertebrates including brachiopods, trilobites, bivalves and corals; many species from each of these groups went extinct during this time. The cause of this extinction? It’s thought that the main catalyst was the movement of the supercontinent Gondwana into Earth’s southern hemisphere, which caused sea levels to rise and fall repeatedly over a period of millions of years, eliminating habitats and species. The onset of a late Ordovician ice age and changes in water chemistry may also have been factors in this extinction. 
@@ -482,7 +482,7 @@ Named Nyasasaurus parringtoni, the roughly 243-million-year-old fossils represen
     |]
     "https://www.amnh.org/shelf-life/six-extinctions",
 
-    CalendarEntry (445 & millionYearsAgo) Nothing
+    CalendarEntry (252 & millionYearsAgo) Nothing
     "The Great Dying"
     "Mass extinction kills more than 95 percent of marine species and 70 percent of land-dwelling vertebrates"
     [text|
@@ -500,7 +500,7 @@ More than a third of marine species vanished, as did most large amphibians of th
     |]
     "https://www.amnh.org/shelf-life/six-extinctions",
 
-    CalendarEntry (65 & millionYearsAgo) Nothing
+    CalendarEntry (66 & millionYearsAgo) Nothing
     "Dinosaurs extinct"
     "Mammals take over land & sea"
     [text|