diff --git a/Cargo.toml b/Cargo.toml
index f9c43124..9f86a5de 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -70,9 +70,6 @@ path = "query-sql"
 [dependencies.mentat_query_translator]
 path = "query-translator"
 
-[dependencies.mentat_tx]
-path = "tx"
-
 [dependencies.mentat_tolstoy]
 path = "tolstoy"
 
diff --git a/README.md b/README.md
index 0acc6822..c25e2914 100644
--- a/README.md
+++ b/README.md
@@ -183,10 +183,6 @@ This crate defines the structs and enums that are the output of the query parser
 
 Similarly, this crate defines an abstract representation of a SQL query as understood by Mentat. This bridges between Mentat's types (_e.g._, `TypedValue`) and SQL concepts (`ColumnOrExpression`, `GroupBy`). It's produced by the algebrizer and consumed by the translator.
 
-#### `mentat_tx`
-
-Mentat has two main inputs: reads (queries) and writes (transacts). Just as `mentat_query` defines the types produced by the query parser, `mentat_tx` defines the types produced by the tx parser.
-
 ### Query processing
 
 #### `mentat_query_algebrizer`
diff --git a/db/Cargo.toml b/db/Cargo.toml
index 76b2d5c1..668da59b 100644
--- a/db/Cargo.toml
+++ b/db/Cargo.toml
@@ -27,9 +27,6 @@ path = "../core"
 [dependencies.mentat_sql]
 path = "../sql"
 
-[dependencies.mentat_tx]
-path = "../tx"
-
 # Should be dev-dependencies.
 [dependencies.tabwriter]
 version = "1.0.3"
diff --git a/db/src/bootstrap.rs b/db/src/bootstrap.rs
index bc910d41..d133f26f 100644
--- a/db/src/bootstrap.rs
+++ b/db/src/bootstrap.rs
@@ -16,7 +16,7 @@ use edn::types::Value;
 use edn::symbols;
 use entids;
 use db::TypedSQLValue;
-use mentat_tx::entities::Entity;
+use edn::entities::Entity;
 use mentat_core::{
     IdentMap,
     Schema,
diff --git a/db/src/cache.rs b/db/src/cache.rs
index 8a8a2c40..dad957bd 100644
--- a/db/src/cache.rs
+++ b/db/src/cache.rs
@@ -97,7 +97,7 @@ use mentat_sql::{
     SQLQuery,
 };
 
-use mentat_tx::entities::{
+use edn::entities::{
     OpType,
 };
 
diff --git a/db/src/db.rs b/db/src/db.rs
index 17b74938..de2ea52d 100644
--- a/db/src/db.rs
+++ b/db/src/db.rs
@@ -1096,7 +1096,7 @@ mod tests {
         InternSet,
     };
     use mentat_core::util::Either::*;
-    use mentat_tx::entities::{
+    use edn::entities::{
         OpType,
         TempId,
     };
diff --git a/db/src/debug.rs b/db/src/debug.rs
index 70e9b1d2..a8e330b9 100644
--- a/db/src/debug.rs
+++ b/db/src/debug.rs
@@ -31,7 +31,9 @@ use mentat_core::{
     TypedValue,
     ValueType,
 };
-use mentat_tx::entities::{Entid};
+use edn::entities::{
+    Entid,
+};
 use schema::{
     SchemaBuilding,
 };
diff --git a/db/src/errors.rs b/db/src/errors.rs
index 7dfca817..d198081b 100644
--- a/db/src/errors.rs
+++ b/db/src/errors.rs
@@ -17,7 +17,7 @@ use std::collections::{
 
 use rusqlite;
 
-use mentat_tx::entities::{
+use edn::entities::{
     TempId,
 };
 use mentat_core::{
diff --git a/db/src/internal_types.rs b/db/src/internal_types.rs
index 306cb04a..34f73d09 100644
--- a/db/src/internal_types.rs
+++ b/db/src/internal_types.rs
@@ -47,8 +47,8 @@ use types::{
     TypedValue,
     ValueType,
 };
-use mentat_tx::entities;
-use mentat_tx::entities::{
+use edn::entities;
+use edn::entities::{
     EntityPlace,
     OpType,
     TempId,
diff --git a/db/src/lib.rs b/db/src/lib.rs
index 57be7490..39ec8820 100644
--- a/db/src/lib.rs
+++ b/db/src/lib.rs
@@ -26,7 +26,6 @@ extern crate time;
 #[macro_use] extern crate edn;
 #[macro_use] extern crate mentat_core;
 extern crate mentat_sql;
-extern crate mentat_tx;
 
 use std::iter::repeat;
 
diff --git a/db/src/tx.rs b/db/src/tx.rs
index 769f7d55..028e0652 100644
--- a/db/src/tx.rs
+++ b/db/src/tx.rs
@@ -103,8 +103,8 @@ use mentat_core::{
 
 use mentat_core::intern_set::InternSet;
 
-use mentat_tx::entities as entmod;
-use mentat_tx::entities::{
+use edn::entities as entmod;
+use edn::entities::{
     AttributePlace,
     Entity,
     OpType,
diff --git a/db/src/tx_observer.rs b/db/src/tx_observer.rs
index 565a0736..10c49bb8 100644
--- a/db/src/tx_observer.rs
+++ b/db/src/tx_observer.rs
@@ -32,7 +32,7 @@ use mentat_core::{
     TypedValue,
 };
 
-use mentat_tx::entities::{
+use edn::entities::{
     OpType,
 };
 
diff --git a/db/src/types.rs b/db/src/types.rs
index af5c7f9f..70ea4964 100644
--- a/db/src/types.rs
+++ b/db/src/types.rs
@@ -29,7 +29,7 @@ pub use self::mentat_core::{
     ValueType,
 };
 
-use mentat_tx::entities::{
+use edn::entities::{
     EntityPlace,
     TempId,
 };
diff --git a/db/src/upsert_resolution.rs b/db/src/upsert_resolution.rs
index 7e748757..5f90821c 100644
--- a/db/src/upsert_resolution.rs
+++ b/db/src/upsert_resolution.rs
@@ -45,7 +45,7 @@ use mentat_core::{
     Schema,
     TypedValue,
 };
-use mentat_tx::entities::OpType;
+use edn::entities::OpType;
 use schema::SchemaBuilding;
 
 /// A "Simple upsert" that looks like [:db/add TEMPID a v], where a is :db.unique/identity.
diff --git a/db/src/watcher.rs b/db/src/watcher.rs
index 15d8b3b7..d646fbde 100644
--- a/db/src/watcher.rs
+++ b/db/src/watcher.rs
@@ -23,7 +23,7 @@ use mentat_core::{
     TypedValue,
 };
 
-use mentat_tx::entities::{
+use edn::entities::{
     OpType,
 };
 
diff --git a/src/entity_builder.rs b/src/entity_builder.rs
index 13516cdc..263ed604 100644
--- a/src/entity_builder.rs
+++ b/src/entity_builder.rs
@@ -15,7 +15,7 @@
 // The internal data format for transacting is required to encode the complexities of
 // processing that format: temporary IDs, lookup refs, input spans, etc.
 //
-// See mentat_tx::entities::Entity and all of its child enums to see how complex this gets.
+// See edn::entities::Entity and all of its child enums to see how complex this gets.
 //
 // A programmatic consumer doesn't want to build something that looks like:
 //
@@ -75,7 +75,7 @@ use mentat_db::internal_types::{
     TypedValueOr,
 };
 
-use mentat_tx::entities::{
+use edn::entities::{
     OpType,
     TempId,
 };
diff --git a/src/lib.rs b/src/lib.rs
index 77e4ec32..7d783ea8 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -30,7 +30,6 @@ extern crate mentat_query_pull;
 extern crate mentat_query_translator;
 extern crate mentat_sql;
 extern crate mentat_tolstoy;
-extern crate mentat_tx;
 
 pub use mentat_core::{
     Attribute,
diff --git a/tx/Cargo.toml b/tx/Cargo.toml
deleted file mode 100644
index cb93106a..00000000
--- a/tx/Cargo.toml
+++ /dev/null
@@ -1,8 +0,0 @@
-[package]
-name = "mentat_tx"
-version = "0.0.1"
-workspace = ".."
-
-[dependencies]
-[dependencies.edn]
-  path = "../edn"
diff --git a/tx/README.md b/tx/README.md
deleted file mode 100644
index fc8f6166..00000000
--- a/tx/README.md
+++ /dev/null
@@ -1 +0,0 @@
-This sub-crate implements the core types used by the transaction processor.
diff --git a/tx/src/lib.rs b/tx/src/lib.rs
deleted file mode 100644
index ad503e05..00000000
--- a/tx/src/lib.rs
+++ /dev/null
@@ -1,13 +0,0 @@
-// Copyright 2016 Mozilla
-//
-// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
-// this file except in compliance with the License. You may obtain a copy of the
-// License at http://www.apache.org/licenses/LICENSE-2.0
-// Unless required by applicable law or agreed to in writing, software distributed
-// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
-// CONDITIONS OF ANY KIND, either express or implied. See the License for the
-// specific language governing permissions and limitations under the License.
-
-#[allow(unused_imports)]
-#[macro_use] extern crate edn;
-pub use edn::entities;